Pius XII, P. (1956). Psychological method of natural painless childbirth: Address. National Catholic Welfare Conference.
Chicago-referens (17:e uppl.)Pius XII, Pope. Psychological Method of Natural Painless Childbirth: Address. Washington: National Catholic Welfare Conference, 1956.
MLA-referens (8:e uppl.)Pius XII, Pope. Psychological Method of Natural Painless Childbirth: Address. National Catholic Welfare Conference, 1956.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.