Yenne, B. (2013). Hap Arnold: The general who invented the U.S. Air Force. Regnery History.
Lua i Stíl Chicago (17ú heag.)Yenne, Bill. Hap Arnold: The General Who Invented the U.S. Air Force. Washington, DC: Regnery History, 2013.
Lua MLA (9ú heag.)Yenne, Bill. Hap Arnold: The General Who Invented the U.S. Air Force. Regnery History, 2013.
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