| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| Abdul Baha and the promised age | | 1927 | Ruth Berkeley White | |  | |  | |
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| Abdul Baha in Egypt | | 1929 | Mirza Ahmad Sohrab | |  | | | |
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| Abdul Baha on divine philosophy | | 1918 | Isabel Fraser Chamberlain, "Abdu’l-Bahá | | | | | | 
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| Abdul Baha's questioned will and testament | | 1946 | Ruth Berkeley White | | | | | |
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| The Bahai movement: a series of nineteen papers upon the Bahai movement | | 1912 | Charles Mason Remey | | | | | |   
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| The Bahai religion and its enemy, the Bahai organization | | 1929 | Ruth Berkeley White | | | | | |
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| Bahai: the spirit of the age | | 1921 | Horace Holley | | | | | |
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| Bahaism and its claims: a study of the religion promulgated by Baha Ullah and Abdul Baha | | 1915 | Samuel Graham Wilson | | | | | |
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| Basic ideas in religion: or, Apologetic theism | | 1916 | Paul Micou, Richard W. (Richard Wilde) Micou | | | | | |
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| Behá 'U'lláh (The glory of God) | | 1900 | Ibrahim George Kheiralla, Howard MacNutt | | | | | |
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| The Book of the Mainyo-i-Khard: The Pazand and Sanskrit Texts (in Roman Characters) as Arranged by Neriosengh Dhaval in the Fifteenth Century; With an English Translation, a Glossary of the Pazand Text, Containing the Sanskrit, Persian and Pahlavi Equivalents, a Sketch of Pazand grammar, and an Introduction | | 1871 | Edward William West, Nairiu-sangh |  | | | | |
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| The Celestial and his religions: or, The religious aspect in China. Being a series of lectures on the religions of the Chinese. | | 1906 | J. Dyer (James Dyer) Ball |  | | | | |
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| The Complete Text of the Pahlavi Dinkard | | 1911 | Dhanjishah Meherjibhai Madan | | | | | |
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| Constructive principles of the Bahai movement: a summary of the history, object and institutions of the Bahai religious teachings | | 1917 | Charles Mason Remey | | | | | |
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| Das Geheimnis der Goldenen Blüte: ein chinesisches Lebensbuch | | 1929 | Richard Wilhelm, C. G. (Carl Gustav) Jung | | | | | |
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| Dawn thought on the reconciliation: a volume of pantheistic impressions and glimpses of larger religion | 2d ed., rev., with appendix. | 1904 | J. Wm. (John William) Lloyd, John William Lloyd | | | | | |
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| The divine art of living | | 1926 | Horace Holley, "Abdu’l-Bahá | | | |  | |
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| Divine wisdoM | | 1925 | Bhagat Singh Thind | | | | | |
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| Essays on the sacred language, writings, and religion of the Parsis | 4th ed., | 1907 | Martin Haug, Edward William West, E. P. (Edward Payson) Evans | | | | | |
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| The essentials of theism | | 1950 | D. J. B. (Denis John Bernard) Hawkins | | | | | |
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| From gaslight to dawn: an autobiography | | 1956 | Julie Olin Chanler | | | | | |
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| God infinite, the world and reason: some theses from natural theology | | 1943 | William Joseph Brosnan | | | | | |
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| Gott jenseits von theismus und pantheismus | | 1928 | Hermann Schwarz | | | | | |
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| Greek Folk-Songs From the Ottoman Provinces of Northern Hellas | | 1888 | Lucy Mary Jane Garnett, John S. Stuart-Glennie | | | | | |
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| Greek Folk-Songs From the Turkish Provinces of Greece | | 1885 | Lucy Mary Jane Garnett, John S. Stuart-Glennie | | | | | |
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| Humanism versus theism | | 1951 | Julian Norris Hartt, J. A. C. Fagginger (Johannes Abraham Christoffel Fagginger) Auer | | | | | |
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| Immortality and theism | | 1921 | William W. (William Wallace) Fenn | | | | | |
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| Indian philosophy. | | 1923 | S. (Sarvepalli) Radhakrishnan | | | | | |
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| The inner life and the Tao-teh-king | | 1912 | C. H. A. (Carl Henrik Andreas) Bjerregaard | | | | | |
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| Institutiones theologiae naturalis ad usum scholarum accomodatae | | 1921 | William Joseph Brosnan | | | | | |
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| The Kalpa sutra, and Nava tatva: two works illustrative of the Jain religion and philosophy | | 1848 | J. (John) Stevenson | | | | | |
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| L'Être et les êtres | | 1936 | Maurice Blondel |  | | | | |
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| L'uno | | 1927 | Luigi Podestà |  | | | | |
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| Le génie celtique et le monde invisible | | 1927 | Léon Denis | | | | | |
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| Le panthéisme d'occident: ou, Le super-laïeisme et le fondement métaphysique de la république et du socialisme hiérarchiques; la nouvelle âme et le nouveau Dieu, la nouvelle église et le nouvel État | | 1928 | Jean Bernard Joachim Izoulet | | | | | |
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| Les religions de l'Inde | | 1879 | Auguste Barth | | | | | |
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| Life eternal: excerpts from the writings of Bahá'u'lláh and 'Abdu'l-Bahá | | 1936 | Bahá’u’lláh | | | | | |
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| Living pictures in the great drama of the 19th century | | 1933 | Mirza Ahmad Sohrab, Mrs Julie (Olin) Chanler | | | | | |
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| Man's vision of God, and the logic of theism | | 1941 | Charles Hartshorne | | | | | |
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| The message of Zoroaster | | 1924 | Ardaser Sorabjee N. Wadia | | | | | |
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| Mirage and truth | | 1935 | Martin Cyril D'Arcy | | | | | |
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| Mirage and truth | | 1935 | Martin Cyril D'Arcy | | | | | |
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| Mithra, Zoroastre et la préhistoire aryenne du christianisme. Avec vingt-trois illustrations hors texte | | 1935 | Charles Autran | | | | | |
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| A modern pilgrimage to Palestine | | 1925 | L. B. Pemberton | | | | | |
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| Must we part with God?: A short study in theism | | 1925 | Ernest F. Champness, John W. Graham | | | | | |
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| The new humanity: a compendium of the ideals of universal civilization | | 1927 | Mirza Ahmad Sohrab | | | | | |
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| O Christians!: Why do ye believe not on Christ! | | 1917 | Ibrahim George Kheiralla | | | | | |
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| Our perfecting world: Zarathushtra's way of life | | 1930 | Maneckji Nusservanji Dhalla | | | | | |
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| The Parsees: their history, manners, customs, and religion | | 1858 | Dosabhai Framji Karaka | | | | | |
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| The Parsis in India: Being an Enlarged and Copiously Annotated, Up to Date English Edition of Mlle. Delphine Menant's "Les Parsis" | | 1917 | Delphine Menant, M. M. Murzban |  | | | | |
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| Personal elements in religious life | | 1916 | Willis D. (Willis Duke) Weatherford | | | | | |
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| Portals to freedom | | 1937 | Howard Colby Ives | | | | | |
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| The price of peace | | 1921 | Stinson Jarvis | | | | | |
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| The problem of religion | | 1912 | Emil Carl Wilm | | | | | |
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| The promise of all ages | | 1935 | George Townshend | | | | | |
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| The promise of all ages | | 1935 | George Townshend, Christophil | | | | | |
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| The rainbow bridge: a study of paganism | | 1934 | John Strong Newberry | | | | | |
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| Religion in China: universism. a key to the study of Taoism and Confucianism | | 1912 | J. J. M. de (Jan Jakob Maria) Groot, J. J. M. | | | | | |
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| Selected writings of Bahá’u’lláh | | 1942 | Bahá’u’lláh | | | | | |
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| The solving of the world-riddle | | 1915 | Henry Clay Mabie | | | | | |
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| The soul of the Bantu: a sympathetic study of the magico-religious practices and beliefs of the Bantu tribes of Africa | | 1928 | William Charles Willoughby | | | | | |
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| Spinoza et le panthéisme religieux | | 1937 | Paweł Siwek | | | | | |
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| A system of natural theism | | 1917 | Leander Sylvester Keyser | | | | | |
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| A system of natural theism | 2d ed., rev. | 1927 | Leander Sylvester Keyser | | | | | |
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| Tao ... a rendering into English verse of the Tao teh ching of Lao Tsze (B. C. 604) | | 1926 | Charles Henry Mackintosh, Laozi | | | | | |
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| Tennant's philosophical theology | | 1940 | Delton Lewis Scudder | | | | | |
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| Theism and humanism | | 1915 | Earl of Arthur James Balfour Balfour | | | | | |
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| Theism and the scientific spirit | | 1933 | Walter Marshall Horton | | | | | |
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| The theism of Edgar Sheffield Brightman | | 1936 | James John McLarney | | | | | |
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| The treasure of the Magi: a study of modern Zoroastrianism | | 1917 | James Hope Moulton | | | | | |
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| Vejen jeg gik-- | | 1920 | Anna Hude |  | | | | |
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| Zoroastrian civilization: from the earliest times to the downfall of the last Zoroastrian empire, 651 A.D | | 1922 | Maneckji Nusservanji Dhalla | | | | | |
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| The Zoroastrian doctrine of a future life: from death to the individual judgment | | 1926 | A. V. W. Jackson, Jal Dastur Cursetji Pavry | | | | | |
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| The Zoroastrian doctrine of a future life: from death to the individual judgment | | 1929 | A. V. W. Jackson, Jal Dastur Cursetji Pavry | | | | | |
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| Zoroastrian studies: the Iranian religion and various monographs | | 1928 | A. V. Williams (Abraham Valentine Williams) Jackson, A. V. W. Williams | | | | | |
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| Zoroastrianism and Judaism | | 1918 | George William Carter, Charles Gray Shaw | | | | | |
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