de Waal -- Peacemaking Among Primates -- 1989 | ||
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| 2003 | - | The Language Mosaic and its Evolution - Hurford |
| ----- 1989. Peacemaking among Primates. Cambridge, MA: Harvard University Press.
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| 2005 | - | Conceptual complexity and the brain: understanding language origins - Schoenemann |
| de Waal, Frans. 1989. Peacemaking Among Primates. Cambridge: Harvard University Press.
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| 2004 | - | The evolution of vocabulary - Smith |
| de Waal, F.B.M., 1989. Peacemaking among Primates. Harvard University Press, Cambridge, MA.
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