Ramírez, Oscar D., and Héctor Gandía. “Comparison of Nine Planting Distances on the Yield of Pineapple Variety PR 1-67”. The Journal of Agriculture of the University of Puerto Rico 66, no. 2 (April 1, 1982): 130–138. Accessed April 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7656.