O'Brien, D. J. (1992). Isaac Hecker: An American Catholic. Paulist Press.
Chicago Style aipamenaO'Brien, David J. Isaac Hecker: An American Catholic. New York: Paulist Press, 1992.
MLA aipamenaO'Brien, David J. Isaac Hecker: An American Catholic. Paulist Press, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.