W. Christopher Wozencraft, "Family Ursidae," Mammal Species of the World, (3rd ed.), Don E. Wilson & DeeAnn M. Reeder (ed.), Johns Hopkins University Press, 2005, p. 586-590.
Andrew C. Kitchener, Eva Bellemain, Xiang Ding, Alexander Kopatz, Verena E. Kutschera, Valentina Salomashkina, Manuel Ruiz-Garcı´a, Tabitha Graves, Yiling Hou, Lars Werdelin, & Axel Janke, “Chapter 1 - Systematics, Ecology, and Behavior Systematics, Evolution, and Genetics of Bears,” In: Vincenzo Penteriani & Mario Melletti (eds.), Bears of the World: Ecology, Conservation and Management Cambridge University Press, 2020, Pages 3-20.
Baskin, J.A. & Tedford, R.H. 1996. Small Arctoid and Feliform Camivorans. In: Prothero, D.R. & Emry, R.J. (eds.). The Terrestrial Eocene-Oligocene Transition in North America. Cambridge University Press: Cambridge. pp. 486–497. doi:10.1017/CBO9780511665431.025.
Flynn, J. J.; Finarelli, J. A.; Zehr, S.; Hsu, J.; Nedbal, M. A. (2005). “Molecular phylogeny of the Carnivora (Mammalia): Assessing the impact of increased sampling on resolving enigmatic relationships”. Systematic Biology54 (2): 317–37. doi:10.1080/10635150590923326. PMID16012099.
Flynn, J. J.; Finarelli, J. A.; Zehr, S.; Hsu, J.; Nedbal, M. A. (2005). “Molecular phylogeny of the Carnivora (Mammalia): Assessing the impact of increased sampling on resolving enigmatic relationships”. Systematic Biology54 (2): 317–37. doi:10.1080/10635150590923326. PMID16012099.