Samuels, George, and Hector Sandía Díaz. “Effects of Potassium Chloride and Sulfate on Pineapple Yields and Quality”. The Journal of Agriculture of the University of Puerto Rico 44, no. 1 (January 1, 1960): 16–20. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12100.