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Corey S. Davis; Isabelle Delisle; Ian Stirling; Donald B. Siniff & Curtis Strobeck (2004). "A phylogeny of the extant Phocidae inferred from complete mitochondrial DNA coding regions". Molecular Phylogenetics and Evolution. 33 (2): 370–380. Bibcode:2004MolPE..33..363D. doi:10.1016/j.ympev.2004.06.006. PMID15336671.
Hoover, C (2013). "Effects of hunting, fishing and climate change on the Hudson bay marine ecosystem: Ii. Ecosystem model future projections". Ecological Modelling. 264: 143–156. Bibcode:2013EcMod.264..143H. doi:10.1016/j.ecolmodel.2013.01.010.
Corey S. Davis; Isabelle Delisle; Ian Stirling; Donald B. Siniff & Curtis Strobeck (2004). "A phylogeny of the extant Phocidae inferred from complete mitochondrial DNA coding regions". Molecular Phylogenetics and Evolution. 33 (2): 370–380. Bibcode:2004MolPE..33..363D. doi:10.1016/j.ympev.2004.06.006. PMID15336671.
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Miyazaki, Nobuyuki (2009). "Ringed, Caspian and Baikal Seals". In Perrin, William F.; Wursig, Bernd; Thewissen, J. G. M. (eds.). Encyclopedia of Marine Mammals (2nd ed.). Burlington, MA: Academic Press. pp. 1033–1036. ISBN978-0-12-373553-9. Archived from the original on 2009-11-09.