Reference
- On Top of the World, Holt , Mary Ann Fraser, 1991
- Into the Thin Air of Everest Mountain of Dreams Mountain of Doom: Movie , 1997, Atlas Media Corporation
- National Geographic Vol. 192, No. 3, September 1997
- National Geographic Vol. 160, No. 4, October 1981
- www.everest.com : website
- World Book Encyclopedia , 1994
- Pictures by Todd Burleson
- Nepal, Children of the World Books,Photographs by Hitomi Watanabe,1986
- Sir Edmund Hillary,A World Explorer,1970
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