http://www.pictonb.freeserve.co.uk/nudibranchs/okeele.html
http://nhm.org/~dgeiger/okenia.html
http://www.bio.bris.ac.uk/teaching/units/b11000/nudi2.htm
http://www.medslugs.de/E/Atl-NE/Okenia_elegans/Selection.htm
http://www.seaslugforum.net/showall/okeneleg
http://www.ugr.es/~lstocino/okenia_elegans.htm
http://www.habitas.org.uk/marinelife/species.asp?item=W13020
https://opistobranquis.info/en/guia/nudibranchia/doridina/doridoidei/onchidoridoidea/okenia-elegans/
http://www.medslugs.de/E/Med/Okenia_elegans/Selection.htm