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Fig. 3 in Peacock, Elizabeth (2015-01-06). "Implications of the Circumpolar Genetic Structure of Polar Bears for Their Conservation in a Rapidly Warming Arctic". PLoS ONE 10 (1): e112021. DOI:10.1371/journal.pone.0112021. PMID 25562525. PMC: PMC4285400. ISSN 1932-6203.
IUCN/SSC Polar Bear Specialist Group (2021)       Status Report on the World’s Polar Bear Subpopulations, IUCN
Isochrone