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Miyazaki, N. (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.
Meier, H. E. M.; Döscher, R.; Halkka, A. (2004). "Simulated Distributions of Baltic Sea-ice in Warming Climate and Consequences for the Winter Habitat of the Baltic Ringed Seal". Ambio. 33 (4): 249–256. Bibcode:2004Ambio..33..249M. doi:10.1579/0044-7447-33.4.249.
Angliss R. P. & Outlaw R. B. (Revised 15 May 2006) "Ringed Seal (Phoca hispida): Alaska Stock". "Alaska Marine Mammal Stock Assessments". NOAA Technical Memorandum AFSC168: 51-55.
Miyazaki, N. (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.