APA-referens (7:e uppl.)

O'Brien, J. A. (1941). Character formation: A story of habits and ideals. Paulist Press.

Chicago-referens (17:e uppl.)

O'Brien, John A. Character Formation: A Story of Habits and Ideals. New York: Paulist Press, 1941.

MLA-referens (8:e uppl.)

O'Brien, John A. Character Formation: A Story of Habits and Ideals. Paulist Press, 1941.