http://www.ugr.es/~lstocino/cymbulia_peronii.htm
http://www.medslugs.de/E/Med/Cymbulia_peronii/Selection.htm
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=291
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=292
http://opistobranquis.info/en/guia/thecosomata/cymbulia-peronii/