Jain, G.P. and Yadav, D.C. 1967. The excretory system in Echinostome Cercariae (Trematoda). Revista de Biología Tropical. 15, 1 (Jul. 1967), 185–193. DOI:https://doi.org/10.15517/rev.biol.trop. v15i1.28485.