Engel, J. A. (2007). Cold War at 30,000 feet: The Anglo-American fight for aviation supremacy. Harvard University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEngel, Jeffrey A. Cold War at 30,000 Feet: The Anglo-American Fight for Aviation Supremacy. Cambridge, Mass.: Harvard University Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEngel, Jeffrey A. Cold War at 30,000 Feet: The Anglo-American Fight for Aviation Supremacy. Harvard University Press, 2007.
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