Caro-Costas, Rubén, José Vicente-Chandler, and Fernando Abruña. “Effect of Four Levels of Fertilization on Beef Production and Carrying Capacity of Pangola Grass Pastures in the Humid Mountain Region of Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 56, no. 3 (July 1, 1972): 219–222. Accessed March 28, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10827.