APA (7th ed.) Zitazioa
Pepperberg, I. M. (1999). The Alex studies: Cognitive and communicative abilities of grey parrots. Harvard University Press.
Chicago Style (17th ed.) Zitazioa
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Cambridge, MA: Harvard University Press, 1999.
MLA (9th ed.) Zitazioa
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Harvard University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.