de León, Delfín, Teodoro Ruiz, and Rubén Quiñones. “Ectrin Spray in Combination With Ectrin Eartags and the Control of Boophilus Microplus (Canestrini) in Dairy Cattle”. The Journal of Agriculture of the University of Puerto Rico 71, no. 3 (July 1, 1987): 241–247. Accessed March 29, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/6964.