50th Anniversary Celebration .... Yet, among hunter gatherers, monogamy is not universal and there is no social rule for it as in modern Western countries (Leakey and Lewin, 1978). .... (1446 6 )
Understanding Nature & Ecology .... New York: HarperCollins Books, 1993. Leakey, Richard and Roger Lewin. The sixth extinction. Patterns of life and the future of humankind. .... (2979 12 )
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