APA (7th ed.) Citation

O'Brien, D. J. (1992). Isaac Hecker: An American Catholic. Paulist Press.

Chicago Style (17th ed.) Citation

O'Brien, David J. Isaac Hecker: An American Catholic. New York: Paulist Press, 1992.

MLA (8th ed.) Citation

O'Brien, David J. Isaac Hecker: An American Catholic. Paulist Press, 1992.