Whittlesey, D. (1939). The earth and the state. New York: Henry holt and company.
Παραπομπή Chicago StyleWhittlesey, Derwent. The Earth and the State. New York: Henry holt and company, 1939.
Παραπομπή MLAWhittlesey, Derwent. The Earth and the State. New York: Henry holt and company, 1939.
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