http://rfbolland.com/okislugs/bullline.html
http://www.uow.edu.au/science/research/affrc/shellcove/bullina.html
http://www.seaslugforum.net/showall/bullline
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.medslugs.de/E/Pac-NW/Bullina_lineata/Selection.htm
http://seaslugs.free.fr/nudibranche/a_bulli_lineata.htm
http://gastropods.com/9/Shell_4029.shtml
http://www.seaslugsofhawaii.com/species/Bullina-lineata-a.html
http://www.underwaterkwaj.com/nudi/hawaii/hc03.htm
http://www.medslugs.de/E/Pac-SW/Bullina_lineata/Selection.htm
http://www.scuba-equipment-usa.com/marine/NOV04/Lined_Bubble_Shell(Bullina_lineata).html
http://www.nudipixel.net/species/bullina_lineata/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=505
http://tahitinudi.jimdo.com/liste-des-espèces/bullina-lineata/
http://www.nmr-pics.nl/Bullinidae/album/index.html
http://www.dragonmouse.com.au/diving/nudibase.php?action=nudidetail&id=292