Rivera, Edmundo, José Rodríguez, and Fernando Abruña. “Crop Response to Soil Acidity Factors in Ultisols and Oxisols in Puerto Rico. XII. Tomatoes”. The Journal of Agriculture of the University of Puerto Rico 69, no. 3 (July 1, 1985): 357–365. Accessed March 29, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7362.