Carlo, Ismael. “Value and Cost of Farm-Mixed Rations Used in Swine-Feeding Trials at Lajas Substation”. The Journal of Agriculture of the University of Puerto Rico 44, no. 3 (July 1, 1960): 150–153. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12089.