Wolf, K. (1994). Personalities and problems: Interpretative essays in world civilizations. New York: McGraw-Hill.
Dyfyniad Arddull ChicagoWolf, Ken. Personalities and Problems: Interpretative Essays in World Civilizations. New York: McGraw-Hill, 1994.
Dyfyniad MLAWolf, Ken. Personalities and Problems: Interpretative Essays in World Civilizations. New York: McGraw-Hill, 1994.
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