https://academic.oup.com/zoolinnean/advance-article/doi/10.1093/zoolinnean/zly048/5098244?guestAccessKey=5fd02506-1dcc-4169-aec3-f1cbc4e3066c
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Hypselodoris_violacea.htm
http://www.medslugs.de/E/Pac-W/Hypselodoris_violacea/Selection.htm