APA način citiranja (7. izdanje)
Pepperberg, I. M. (1999). The Alex studies: Cognitive and communicative abilities of grey parrots. Harvard University Press.
Čikaški stil citiranja (17. izdanje)
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Cambridge, MA: Harvard University Press, 1999.
MLA način citiranja (9. izdanje)
Pepperberg, Irene M. The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots. Harvard University Press, 1999.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.