Ramírez, Carmen T., Fernando Abruña, José Lozano, and José Vicente-Chandler. “Effect of Fertilization on Yields of Three Varieties of Rice at Two Locations in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 59, no. 1 (January 1, 1975): 1–4. Accessed April 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10623.