Allen, H. C. 1. (1965). The United States of America: A concise history. New York: Frederick A. Praeger.
शिकागो स्टाइल उद्धरणAllen, Harry Cranbrook 1917-1998. The United States of America: A Concise History. New York: Frederick A. Praeger, 1965.
एमएलए उद्धरणAllen, Harry Cranbrook 1917-1998. The United States of America: A Concise History. New York: Frederick A. Praeger, 1965.
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