González-Vélez, Agenol, and Juan Ortiz-López. “Yield and Foliar Concentration of Nutrients of Taro ‘Blanca’ Grown With Two Plant Spacings and Three Fertilizer Levels”. The Journal of Agriculture of the University of Puerto Rico 83, no. 1-2 (April 1, 1999): 41–46. Accessed June 28, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/3859.