APA-referens (7:e uppl.)
Kreeft, P. (1990). Everything you wanted to know about heaven... but never dreamed of asking (First complete edition.). Ignatius Press.
Chicago-referens (17:e uppl.)
Kreeft, Peter. Everything You Wanted to Know About Heaven... but Never Dreamed of Asking. First complete edition. San Francisco: Ignatius Press, 1990.
MLA-referens (9:e uppl.)
Kreeft, Peter. Everything You Wanted to Know About Heaven... but Never Dreamed of Asking. First complete edition. Ignatius Press, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.