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, vol. 46, no. 4, Oct. 1962, pp. 328-33, doi:10.46429/jaupr.v46i4.12352.