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Berta, Annalisa; Churchill, Morgan (2012-07-01). "Pinniped taxonomy: review of currently recognized species and subspecies, and evidence used for their description". Mammal Review. 42 (3): 207–234. doi:10.1111/j.1365-2907.2011.00193.x. ISSN1365-2907.
Daoust, P-Y; Caraguel, C (2012-11-01). "The Canadian harp seal hunt: observations on the effectiveness of procedures to avoid poor animal welfare outcomes". Animal Welfare. 21 (4): 445–455. doi:10.7120/09627286.21.4.445. ISSN0962-7286. S2CID72487796.