Spengler, O. (1934). The hour of decision: Germany and world-historical evolution. New York: A. A. Knopf.
शिकागो स्टाइल उद्धरणSpengler, Oswald. The Hour of Decision: Germany and World-historical Evolution. New York: A. A. Knopf, 1934.
एमएलए उद्धरणSpengler, Oswald. The Hour of Decision: Germany and World-historical Evolution. New York: A. A. Knopf, 1934.
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