APA (7th ed.) Zitazioa
Willke, J. C. (1984). Slavery and abortion (ed.). Hayes Publishing company.
Chicago Style (17th ed.) Zitazioa
Willke, J C. Slavery and Abortion. ed. Cincinnati: Hayes Publishing company, 1984.
MLA (9th ed.) Zitazioa
Willke, J C. Slavery and Abortion. ed. Hayes Publishing company, 1984.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.