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  1. ^ Yu, Li; Li, Yi-Wei; Ryder, Oliver A.; Zhang, Ya-Ping (). „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:10.1186/1471-2148-7-198Accesibil gratuit. PMC 2151078Accesibil gratuit. PMID 17956639. 
  2. ^ Servheen, C.; Herrero, S.; Peyton, B. (). Bears: Status Survey and Conservation Action Plan (PDF). IUCN. pp. 26–30. ISBN 978-2-8317-0462-3. Arhivat din original (PDF) la . 
  3. ^ a b Kumar, V.; Lammers, F.; Bidon, T.; Pfenninger, M.; Kolter, L.; Nilsson, M. A.; Janke, A. (). „The evolutionary history of bears is characterized by gene flow across species”. Scientific Reports. 7: 46487. Bibcode:2017NatSR...746487K. doi:10.1038/srep46487. PMC 5395953Accesibil gratuit. PMID 28422140.