Não informado. (1972). Current literature in family planning. Planned Parenthood Federation of America.
Chicago-referens (17:e uppl.)Não informado. Current Literature in Family Planning. New York: Planned Parenthood Federation of America, 1972.
MLA-referens (8:e uppl.)Não informado. Current Literature in Family Planning. Planned Parenthood Federation of America, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.