Wolf, James M., and Matthew Drosdoff. “Soil Water Studies in Oxisols and Ultisols of Puerto Rico: I. Water Movement”. The Journal of Agriculture of the University of Puerto Rico 60, no. 3 (July 1, 1976): 375–385. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10530.