West, John B. (2003). "Failure on Everest: The Oxygen Equipment of the Spring 1952 Swiss Expedition". High Altitude Medicine & Biology. 4 (1). Mary Ann Liebert Inc: 39–43. doi:10.1089/152702903321488960. ISSN1527-0297. PMID12713710.
nih.gov
pubmed.ncbi.nlm.nih.gov
West, John B. (2003). "Failure on Everest: The Oxygen Equipment of the Spring 1952 Swiss Expedition". High Altitude Medicine & Biology. 4 (1). Mary Ann Liebert Inc: 39–43. doi:10.1089/152702903321488960. ISSN1527-0297. PMID12713710.
"Tenzing Norgay GM". Imaging Everest. The Royal Geographical Society. Archived from the original on 2007-04-14. Retrieved 2007-06-21.
worldcat.org
search.worldcat.org
West, John B. (2003). "Failure on Everest: The Oxygen Equipment of the Spring 1952 Swiss Expedition". High Altitude Medicine & Biology. 4 (1). Mary Ann Liebert Inc: 39–43. doi:10.1089/152702903321488960. ISSN1527-0297. PMID12713710.