de León-Dancel, Delfín. “Life History of Lymnaea Columella (Say) and Its Experimental Infection With Fasciola Hepatica (L.)”. The Journal of Agriculture of the University of Puerto Rico 54, no. 2 (April 1, 1970): 297–305. Accessed November 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/11092.