Garshelis, D.L., Ratnayeke S. & Chauhan, N.P.S. (IUCN SSC Bear Specialist Group): Melursus ursinusIUCN Red List of Threatened Species. Version 2014.1. 2008. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 13.7.2014. (englanniksi)