MolluscaBase eds. (2021). MolluscaBase. Cassis undulata var. ghirma de Gregorio, 1886. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2021) European Register of Marine Species at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=752605 on 2026-07-14
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2026). European Register of Marine Species. Cassis undulata var. ghirma De Gregorio, 1886. Accessed at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=752605 on 2026-07-14