Pepperberg, I. M. (2005) An Avian Perspective on Language Evolution: Implications of simultaneous development of vocal and physical object combinations by a Grey parrot (Psittacus erithacus). In Maggie Tallerman, editor, Language Origins: Perspectives on Evolution . Oxford University Press.

Pepperberg, I. M. (2005) An Avian Perspective on Language Evolution: Implications of simultaneous development of vocal and physical object combinations by a Grey parrot (Psittacus erithacus). In Maggie Tallerman, editor, Language Origins: Perspectives on Evolution. Oxford University Press.

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Knight, Language co-evolved with the rule of law, 2008