APA-referens (7:e uppl.)
Johnson, K. O. (1995). Why do Catholics do that?: A guide to the teachings and practices of the Catholic Church. Ballantine Books.
Chicago-referens (17:e uppl.)
Johnson, Kevin Orlin. Why Do Catholics Do That?: A Guide to the Teachings and Practices of the Catholic Church. New York: Ballantine Books, 1995.
MLA-referens (9:e uppl.)
Johnson, Kevin Orlin. Why Do Catholics Do That?: A Guide to the Teachings and Practices of the Catholic Church. Ballantine Books, 1995.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.