Token Transfers Among Great Apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): Species Differences, Gestural Requests, and Reciprocal Exchange

Pelé, Marie ; Dufour, Valérie ; Thierry, Bernard ; Call, Josep Burghardt, Gordon M

Journal of comparative psychology (1983), 2009-11, Vol.123 (4), p.375-384 [Periódico revisado por pares]

United States: American Psychological Association

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