Pounds, N. J. G. (1972). Political geography (2nd ed.). New York: McGraw-Hill Book Company.
Παραπομπή Chicago StylePounds, Norman John Greville. Political Geography. 2nd ed. New York: McGraw-Hill Book Company, 1972.
Παραπομπή MLAPounds, Norman John Greville. Political Geography. 2nd ed. New York: McGraw-Hill Book Company, 1972.
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