Delfel, N. E., E. Cabanillas, and E. Ortiz-Torres. “A Small-Scale Technique for Evaluation of the Effect of Spray Oils and Other Materials on Sugarcane Yields”. The Journal of Agriculture of the University of Puerto Rico 46, no. 4 (October 1, 1962): 328–333. Accessed April 20, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12352.