2010.3 Database entry includes a lengthy justification of why this species is listed as vulnerable.↑ This combines the Ancient Greek words thalassa/θαλασσα 'sea', and arctos/αρκτος 'bear' and also, with reference to Ursa Major, 'northern' or 'of the north pole' Liddell, Henry George and Robert Scott (1980). A Greek-English Lexicon (Abridged Edition). United Kingdom: Oxford University Press. ISBN 0-19-910207-4.↑ [[[:සැකිල්ල:IUCNlink]] "IUCN Red List: Ursus maritimus"]. සම්ප්‍රවේශය 15 February 2008. {{cite web}}: Check |url= value (help)↑ 10.0 10.1 Lindqvist, Charlotte; Schuster, Stephan C.; Sun, Yazhou; Talbot, Sandra L.; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P.; Kasson, Lindsay; Zeyl, Eve (2010). "Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear". Proceedings of the National Academy of Sciences. 107 (11): 5053–5057. doi:10.1073/pnas.0914266107. PMC 2841953. PMID 20194737.↑ 11.0 11.1 11.2 DeMaster, Douglas P.; Stirling, Ian (8 May 1981). "Ur