Lugo, Wanda I., Héctor M. Lugo, Agenol González, Nydia Rafols, and Carlos Almodóvar. “Tillage and Fertilizer Rate Effects on Yam Yield (Dioscorea Alata L.)”. The Journal of Agriculture of the University of Puerto Rico 77, no. 3-4 (October 1, 1993): 153–159. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/4203.