Claudio Mutti, Les SS au Tibet, article publié sur le site Claudiomutti.com, 10 octobre 2005 : « Outre Schäfer, faisaient partie du groupe quatre Obersturmführer SS : le chef de caravane et " technicien " Edmund Geer, l'anthropologue et ethnologue Bruno Beger, le géographe et géomagnétologue Dr. Karl Wienert, le photographe et opérateur cinématographique Ernst Krause ».
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(en) Joseph Cummins, History's great untold stories: obscure events of lasting importance, Murdoch Books, 2006, 366 p., chap. Explorers of the Deep, en part. p. 326 (ISBN1740458087) : « After returning to Germany, Schäfer was lionised as a veteran explorer of Tibet and published a book about his experiences, Unknown Tibet, in which he called for a German scientific expedition to the country. »
(en) John J. Reilly, Compte rendu du livre de Christopher Hale, Himmler's Crusade, John Wiley & Sons, Hoboken (NJ), 2003 : « Dolan and Schäfer journeyed to eastern Tibet, a debatable land of chronic skirmishing among the Chinese Nationalist government, various war lords, the ineffectual Tibetan army (...) ».
(en) European Theater of Operations, The Activities of Dr Ernst Schaefer, United States Forces - European Theater, Military Intelligence Service Center, APO 757 Final Interrogation Report (OI-FIR) No. 32, Feb. 12, 1946. : « Schaefer was a member of Das Ahnenerbe, the organization founded by Himmler in 1935 to investigate a variety of scientific and pseudo-scientific problems raised in Germany following the Nazi ascension to power ».
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(en) Alex McKay Introduction, in : (en) Alex McKay, Tibet and her neighbours : a history, Londres, Edition Hansjörg Mayer, , 239 p. (ISBN3-88375-718-7, OCLC52784305), p. 16 : « The mission's leader, Ernst Schaeffer, was a serious scientist and apparently a reluctant Nazi »
