Andrews, John S., and José F. Maldonado. “A PRELIMINARY NOTE ON THE INTERNAL PARASITES OF PUERTO RICAN CATTLE WITH SPECIAL REFERENCE TO THOSE SPECIES FOUND IN CALVES SUFFERING FROM ‘TROPICAL DIARRHEA’”. The Journal of Agriculture of the University of Puerto Rico 24, no. 4 (October 1, 1940): 121–132. Accessed November 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/13601.