BeRMS (2025). Carnivora. Accessed at: https://www.marinespecies.org/berms/aphia.php?p=taxdetails&id=2687 on 2025-05-11
VLIZ Belgian Marine Species Consortium (2010 onwards). Belgian Register of Marine Species. Carnivora. Accessed at: https://marinespecies.org/Berms/aphia.php?p=taxdetails&id=2687 on 2025-05-11
basis of recordJefferson, 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]