APA (7th ed.) Citation

O'Brien, J. A. (1947). God: Who is he? Paulist Press.

Chicago Style (17th ed.) Citation

O'Brien, John A. God: Who Is He? New York, N.Y.: Paulist Press, 1947.

MLA (8th ed.) Citation

O'Brien, John A. God: Who Is He? Paulist Press, 1947.