line of the status of plants and animals". World Conservation Union. 12 May 2006 දින මුල් පිටපත වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 1 February 2006.↑ WWF: A Leader in Polar Bear Conservation . Retrieved 29 June 2009, from WFF – Polar Bear Web site: http://www.worldwildlife.org/species/finder/polarbear/polarbear.html#↑ 72.0 72.1 Stirling, Ian (2006). "Possible effects of climate warming on selected populations of polar bears (Ursus maritimus) in the Canadian Arctic" (PDF). Arctic. 59 (3): 261–275. ISSN 0004-0843. සම්ප්‍රවේශය 15 September 2007. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)↑ Stirling, Ian (2004). "Polar bear distribution and abundance on the Southwestern Hudson Bay coast during open water season, in relation to population trends and annual ice patterns" (PDF). Arctic. 57 (1): 15–26. ISSN 0004-0843. 25 September 2007 දින මුල් පිටපත (PDF) වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 15 September 