Holdich, Sir Thomas Hungerford (1906), Tibet, the mysterious, F.A. Stokes Company, p. 288.
Li, Bosheng (2000), «Chapter 11, Nature Conservation», en Zheng, Du; Zhang, Qingsong; Wu, Shaohong, eds., Mountain geoecology and sustainable development of the Tibetan Plateau, Volume 57 of GeoJournal library, Springer, pp. 230-231, ISBN0-7923-6688-3.