Tohutoro APA (7th ed.)
Pepperberg, I. M. (1999). The Alex studies: Cognitive and communicative abilities of grey parrots. Harvard University Press.
Tohutoru Kātū Chicago (17th ed.)
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Cambridge, MA: Harvard University Press, 1999.
Tohutoro MLA (9th ed.)
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Harvard University Press, 1999.
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