Talleyrand, H., R. H. Fox, and M. A. Lugo-López. 1976. “Nitrogen Fertilization of a High Yielding White-Kernel Corn in Oxisols and Ultisols in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 60 (3):336-43. https://doi.org/10.46429/jaupr.v60i3.10526.