Summary of polar bear population status per 2014 (2015). IUCN/SSC PBSG. http://pbsg.npolar.no/en/status/status-table.html. Accessed online 06 April 2015
[2a] Regehr, E.V., Lunn, N.J., Amstrup, S.C. & Stirling, I. (2007). “Effects of earlier sea ice breakup on survival and population size of polar bears in western Hudson Bay.” Journal of Wildlife Management 71(8): 2673–2683. Link to pdf.
 Bromaghin, J.F, McDonald, T. L., Stirling, I., Derocher, A.E., Richardson, E.S., Regehr, E.V., Douglas, D.C., Durner, G.M., Atwood, T. & Amstrup, S.C. In press. “Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline.” Ecological Applications.
 http://video.nationalgeographic.com/video/news/wild-chronicles/arctic-seabirds-wcvin (Polar bear eating birds and birds having difficulty feeding because of pack ice retreat on Cooper Island near Barrow, Alaska.)
 Polar Bears International. (2015). “Polar Bears and Sea Ice Regions.” http://www.polarbearsinternational.org/where-do-polar-bears-live/polar-bears-sea-ice-regions