Gregory, O. (1822). Letters to a friend on the evidences, doctrines and duties of the Christian religion. American Tract Society.
Citace podle Chicago (17th ed.)Gregory, Olinthus. Letters to a Friend on the Evidences, Doctrines and Duties of the Christian Religion. New York: American Tract Society, 1822.
Citace podle MLA (8th ed.)Gregory, Olinthus. Letters to a Friend on the Evidences, Doctrines and Duties of the Christian Religion. American Tract Society, 1822.
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