McDougall, C. (2015). Natural born heroes: How a daring band of misfits mastered the lost secrets of strength and endurance (First edition.). Alfred A. Knopf.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcDougall, Christopher. Natural Born Heroes: How a Daring Band of Misfits Mastered the Lost Secrets of Strength and Endurance. First edition. New York: Alfred A. Knopf, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcDougall, Christopher. Natural Born Heroes: How a Daring Band of Misfits Mastered the Lost Secrets of Strength and Endurance. First edition. Alfred A. Knopf, 2015.
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