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  Author Title Year Publication Serial Volume Pages Links
Pepperberg, I.M.; Brezinsky, M.V. Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size 1991 Journal of Comparative Psychology 3610 105 286-294 details   doi
Hostetter, A.B.; Cantero, M.; Hopkins, W.D. Differential use of vocal and gestural communication by chimpanzees (Pan troglodytes) in response to the attentional status of a human (Homo sapiens) 2001 Journal of Comparative Psychology 4970 115 337-343 details   url
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