Caro-Costas, Ruben, José Vicente-Chandler, and Jacinto Figarella. “The Yields and Composition of Five Grasses Growing in the Humid Mountains of Puerto Rico, As Affected by Nitrogen Fertilization, Season, and Harvest Procedures”. The Journal of Agriculture of the University of Puerto Rico 44, no. 3 (July 1, 1960): 107–120. Accessed March 29, 2023.