Davidson, J. (2011). The ledge: An adventure story of friendship and survival on mount rainier (Unabridged.). Tantor Media.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDavidson, Jim. The Ledge: An Adventure Story of Friendship and Survival on Mount Rainier. Unabridged. Old Saybrook: Tantor Media, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDavidson, Jim. The Ledge: An Adventure Story of Friendship and Survival on Mount Rainier. Unabridged. Tantor Media, 2011.
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