APA (7th ed.) Citation

Machen, J. G. (1923). The origin of Paul's religion. Macmillan.

Chicago Style (17th ed.) Citation

Machen, John Gresham. The Origin of Paul's Religion. New York: Macmillan, 1923.

MLA (9th ed.) Citation

Machen, John Gresham. The Origin of Paul's Religion. Macmillan, 1923.

Warning: These citations may not always be 100% accurate.