Research Conference on Natural Family Planning, W., Urichie, W. A., & Natural family planning. (1973). Proceedings. Human Life Foundations.
Chicago-referens (17:e uppl.)Research Conference on Natural Family Planning, Warrenton, William A. Urichie, och Natural family planning. Proceedings. Washington, D. C: Human Life Foundations, 1973.
MLA-referens (9:e uppl.)Research Conference on Natural Family Planning, Warrenton, et al. Proceedings. Human Life Foundations, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.