Heil, N., & Drummond, D. (2008). Dark summit: The true story of everest's most controversial season (Unabridged.). Tantor Media.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeil, Nick, और David Drummond. Dark Summit: The True Story of Everest's Most Controversial Season. Unabridged. Old Saybrook: Tantor Media, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHeil, Nick, और David Drummond. Dark Summit: The True Story of Everest's Most Controversial Season. Unabridged. Tantor Media, 2008.
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