Alastair Lamb. Tom Browns from Central Asia. Alex Mackay (编). The History of Tibet: The modern period : 1895-1959, the encounter with modernity. Routledge. 2003年: 326–327頁.
British Intelligence on China in Tibet, 1903-1950 （页面存档备份，存于互联网档案馆）, Formerly classified and confidential British intelligence and policy files, Editor: A.J. Farrington, Former Deputy Director, OIOC, British Library, London, IDC Publishers, 2002, p. 22: "A fascinating group of files offers minute detail in an attempt to turn four young Tibetans into a vangard of "modernisers" through the medium of an English public school education."
British Intelligence on China in Tibet, 1903-1950 （页面存档备份，存于互联网档案馆）, Formerly classified and confidential British intelligence and policy files, Editor: A.J. Farrington, Former Deputy Director, OIOC, British Library, London, IDC Publishers, 2002, p. 22: "A fascinating group of files offers minute detail in an attempt to turn four young Tibetans into a vangard of "modernisers" through the medium of an English public school education."
van Schaik, Sam. Tibet: A History. Yale University Press. 2011年6月28日: 192 [2022年9月16日]. ISBN 9780300154047. （原始内容存档于2022年9月21日） –通过Google Books.
