เชิงอรรถในบทที่
2
1Harry
Nelson and Robert Jurmain, Introduction to Physical Anthropology. (Minnesota
: West Publishing Co., 1979), p.7 ; Victor Barnouw, Physical
Anthropology and Archaeology. (Illinois : Dorsey Press, 1978), pp. 4 -
5.
2Jan
van Lawick Goodall, "The Behavior of Chimpanzees in their Natural
Habitat," American Journal of Psychiatry. Vol. 130 No.1
(1973), pp. 1 - 12.
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