URMO (2021). Phocidae Gray, 1821. Accessed at: http://www.marinespecies.org/urmo/aphia.php?p=taxdetails&id=136976 on 2025-09-11
Land J. van der (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO). Phocidae Gray, 1821. Accessed at: https://www.marinespecies.org/urmo/aphia.php?p=taxdetails&id=136976 on 2025-09-11
basis of recordvan der Land, J. (2001). Tetrapoda, <B><I>in</I></B>: Costello, M.J. <i>et al.</i> (Ed.) (2001). <i>European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,</i> 50: pp. 375-376 (look up in IMIS) [details]
additional sourceJefferson, T.A.; Leatherwood, S.; Webber, M.A. (1993). Marine mammals of the world. <em>FAO Species identification guide.</em> FAO: Rome, Italy. ISBN 92-5-103292-0. VIII, 320 pp. (look up in IMIS) [details]
Present Inaccurate Introduced: alien Containing type locality