Lozano, José M., and Fernando Abruña. “Effect of Planting Methods and Seeding Rates on Rice Yields”. The Journal of Agriculture of the University of Puerto Rico 66, no. 3 (July 1, 1982): 194-199. Accessed December 8, 2021. https://revistas.upr.edu/index.php/jaupr/article/view/7666.