↑ Allen, Charles. (1999). The Search for Shangri-La: A Journey into Tibetan History. Abacus Edition, London. (2000), pp. 266-267; 273-274. ISBN 0-349-11142-1.
↑ Tibetan Civilization by R.A. Stein Faber and Faber
↑ Karmey, Samten G. (1975). "'A General Introduction to the History and Doctrines of Bon", p. 180. Memoirs of Research Department of The Toyo Bunko, No, 33. Tokyo.
↑ Lee, Don Y. (1981). The History of Early Relations between China and Tibet: From Chiu t'ang-shu, a documentary survey, pp. 7-9. Eastern Press, Bloomington, IN.
↑ Pelliot, Paul. (1961). Histoire ancienne du Tibet, pp. 3-4. Librairie d'Amérique et d'orient, Paris.
↑ Norbu, Namkhai. (1981). The Necklace of Gzi, A Cultural History of Tibet, p. 30. Information Office of His Holiness The Dalai Lama, Dharamsala, H.P., India.
↑ Beckwith, Christopher I. (1987). The Tibetan Empire in Central Asia, p. 20. Princeton University Press, Princeton, NJ. Fourth printing with new afterword and 1st paperback version. ISBN 0-691-02469-3.
↑ Allen, Charles. The Search for Shangri-La: A Journey into Tibetan History, pp. 127-128. (1999). Reprint: (2000). Abacus, London. ISBN 0-349-11142-1.
↑ Beckwith, Christopher I. The Tibetan Empire in Central Asia. A History of the Struggle for Great Power among Tibetans, Turks, Arabs, and Chinese during the Early Middle Ages, 1987, Princeton: Princeton University Press. ISBN 0-691-02469-3, p. 43.
