Não informado. (1969). Research in Reproduction. International Planned Parenthood Federation.
Chicago-referens (17:e uppl.)Não informado. Research in Reproduction. London: International Planned Parenthood Federation, 1969.
MLA-referens (8:e uppl.)Não informado. Research in Reproduction. International Planned Parenthood Federation, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.