Ardrey, R. (1970). The social contract: A personal inquiry into the evolutionary sources of order and disorder. Collins.
Citace podle Chicago (17th ed.)Ardrey, Robert. The Social Contract: A Personal Inquiry into the Evolutionary Sources of Order and Disorder. London: Collins, 1970.
Citace podle MLA (8th ed.)Ardrey, Robert. The Social Contract: A Personal Inquiry into the Evolutionary Sources of Order and Disorder. Collins, 1970.
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