Offerman, N. (2015). Gumption: Relighting the torch of freedom with america's gutsiest troublemakers (Unabridged.). Penguin Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOfferman, Nick. Gumption: Relighting the Torch of Freedom with America's Gutsiest Troublemakers. Unabridged. New York: Penguin Audio, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOfferman, Nick. Gumption: Relighting the Torch of Freedom with America's Gutsiest Troublemakers. Unabridged. Penguin Audio, 2015.
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