Paulsen, G. (2007). Guts: The true stories behind hatchet and the brian books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPaulsen, Gary. Guts: The True Stories Behind Hatchet and the Brian Books. 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPaulsen, Gary. Guts: The True Stories Behind Hatchet and the Brian Books. 2007.
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