Wapshott, N. (2015). The sphinx: Franklin Roosevelt, the Isolationists, and the road to World War II (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWapshott, Nicholas. The Sphinx: Franklin Roosevelt, the Isolationists, and the Road to World War II. First edition. New York, NY: W.W. Norton & Company, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWapshott, Nicholas. The Sphinx: Franklin Roosevelt, the Isolationists, and the Road to World War II. First edition. W.W. Norton & Company, 2015.
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