Surveyhistory.com

Britannica.com

Zenodo.org

Gonpo: first Chinese atop Mount Qomolangma / cctv.com

Mallory body Everest secret Frank Smythe / The Guardian

Correspondence letters reveal George Mallory flirtatious side / The Guardian

George Mallory new film / The Guardian

The science behind the super abilities of sherpas / Npr.org

Himalayan powerhouses how sherpas have envolved superhuman energy efficiency / cam.ac.uk

Everyculture.com

Sherpa culture / National Geographic

Pnas.org

Edition.cnn.com

Albert Eggler, "Gipfel über den Wolken", Verlag Hallwag Bern, Suiza 1956.

Tibetan history / Exploretibet.com

SNP anual report

El parque nacional Sagarmatha / Alpinismonline Magazine

Whittaker / web

banffcentre.ca/mountainculture

Mountaineers.org

Grayson Schaffer para Outside Magazine

The German French mount Everest Expedition 1978 / Himalayan Club

Jerzy Kukuczka el himalayista humilde / am14.net

Erhard Loretan mountaineer / Independent.co.uk

Alison Biography / scarc.library.oregonstate.edu

Overlooked Alison Hargreaves  / Maya Salam para Nytimes.com

Jon Krakauer Everest Into thin Air story / latimes.com

El espíritu de los ojos azules / Alpinismonline Magazine

Everest David Sharp / Usatoday.com

Damian Benegas entrevista 2014 / Revista Desnivel

Climbing Magazine