Rivera Brenes, L., J. Torres Más, and J. A. Arroyo. “Response of Guinea, Pangola, and Coastal Bermuda Grasses To Different Nitrogen Fertilization Levels Under Irrigation in The Lajas Valley of Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 45, no. 3 (July 1, 1961): 123–146. Accessed December 5, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/13747.