APA (7th ed.) Zitazioa
Duck, S. (1992). Human relationships (2nd ed.). Sage.
Chicago Style (17th ed.) Zitazioa
Duck, Steve. Human Relationships. 2nd ed. London: Sage, 1992.
MLA (9th ed.) Zitazioa
Duck, Steve. Human Relationships. 2nd ed. Sage, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.