Schmidt, S., M. Wolff, and J. A. Vargas. “Population Ecology and Fishery of <i>Cittarium pica</i≫ (Gastropoda: Trochidae) on the Caribbean Coast of Costa Rica”. Revista De Biología Tropical, vol. 50, no. 3-4, Dec. 2002, pp. 1079–1090, https://revistas.ucr.ac.cr/index.php/rbt/article/view/16627.