APA (7th ed.) Zitazioa
Hegeler, S. Peter and caroline: A child asks about childbirth and sex (1a.ed.). Tavistock publications limited.
Chicago Style (17th ed.) Zitazioa
Hegeler, Sten. Peter and Caroline: A Child Asks About Childbirth and Sex. 1a.ed. Londres: Tavistock publications limited.
MLA (9th ed.) Zitazioa
Hegeler, Sten. Peter and Caroline: A Child Asks About Childbirth and Sex. 1a.ed. Tavistock publications limited.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.