Wallbank, W. T. (1965). Civilization: Past and present. Chicago: Scott, Foresman.
शिकागो स्टाइल उद्धरणWallbank, Walter T. Civilization: Past and Present. Chicago: Scott, Foresman, 1965.
एमएलए उद्धरणWallbank, Walter T. Civilization: Past and Present. Chicago: Scott, Foresman, 1965.
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