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^ Yu, Li; Li, Yi-Wei; Ryder, Oliver A.; Zhang, Ya-Ping (2007 ). „Analysis of complete mitochondrial genome sequences increases phylogenetic resolution of bears (Ursidae), a mammalian family that experienced rapid speciation” . BMC Evolutionary Biology . 7 (198): 198. Bibcode :2007BMCEE...7..198Y . doi :10.1186/1471-2148-7-198 . PMC 2151078 . PMID 17956639 .
^ Servheen, C.; Herrero, S.; Peyton, B. (1999 ). Bears: Status Survey and Conservation Action Plan (PDF) . IUCN. pp. 26–30. ISBN 978-2-8317-0462-3 . Arhivat din original (PDF) la 9 octombrie 2022 .
^ a b Kumar, V.; Lammers, F.; Bidon, T.; Pfenninger, M.; Kolter, L.; Nilsson, M. A.; Janke, A. (2017 ). „The evolutionary history of bears is characterized by gene flow across species” . Scientific Reports . 7 : 46487. Bibcode :2017NatSR...746487K . doi :10.1038/srep46487 . PMC 5395953 . PMID 28422140 .