APA (7th ed.) Citation

O'Brien, J. A. (1927). Modern psychology and the mass: A study in the psychology of religion. Paulist Press.

Chicago Style (17th ed.) Citation

O'Brien, John A. Modern Psychology and the Mass: A Study in the Psychology of Religion. New York, N.Y.: Paulist Press, 1927.

MLA (8th ed.) Citation

O'Brien, John A. Modern Psychology and the Mass: A Study in the Psychology of Religion. Paulist Press, 1927.