APA (7th ed.) Zitazioa

Morgan. Collards. The University of Alabama Press.

Chicago Style (17th ed.) Zitazioa

Morgan. Collards. The University of Alabama Press.

MLA (9th ed.) Zitazioa

Morgan. Collards. The University of Alabama Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.