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Watters G.T. & Fraussen K. (2015). A revision of the western Atlantic Ocean genus Engina with notes on Hesperisternia (Gastropoda: Buccinidae: Pisaniinae). The Nautilus. 129(3): 95-117
Daccarett, E. Y. & Bossio, V. S. 2011. Colombian Seashells from the Caribbean Sea. L'Informatore Piceno. 384pp.
Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN1-888569-01-8. IX, 526 + cd-rom pp.