Silva, Servando, and Héber Irizarry. “Effect of Depth of Water Table on Yields of Two Cultivars of Sweet Potatoes”. The Journal of Agriculture of the University of Puerto Rico 65, no. 2 (April 1, 1981): 114–117. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7581.