Pepperberg irene maxine 1999 the alex studies cognitive and communicative abilities of grey parrots cambridge ma harvard university press premack david 1986 gavagai or the future history of the animal language controversy cambridge ma mit press premack david and ann j premack 1984 the mind of an ape new york w w norton co . First its greater sophistication as regards language and the interpenetration of language and inquiry second its attempt to follow the modern example of the sciences in empirical spirit in rigor in attention to detail in respect for alternatives and in objectivity of method and third its use of techniques of symbolic logic brought to full development only in the last fifty years . Sustainable development environmental protection 2010 ojolowo saeed download pdf download full pdf package this paper a short summary of this paper 37 full pdfs related to this paper read paper sustainable development environmental protection download sustainable development environmental protection ojolowo saeed
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