APA (7th ed.) Citation

O'Brien, J. A. (1957). Giants of the faith: Conversions which changed the world. Image Books.

Chicago Style (17th ed.) Citation

O'Brien, John Anthony. Giants of the Faith: Conversions Which Changed the World. Garden City, N. Y: Image Books, 1957.

MLA (9th ed.) Citation

O'Brien, John Anthony. Giants of the Faith: Conversions Which Changed the World. Image Books, 1957.