Lugo-López, M. A., J. Badillo-Feliciano, and L. Calduch. “Response of Native White Beans, Phaseolus Vulgaris, to Various N Levels in an Oxisol”. The Journal of Agriculture of the University of Puerto Rico 61, no. 4 (October 1, 1977): 438–442. Accessed September 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10406.