Lugo-López, M. A., and Modesto Capiel. “Seasonal Changes in Soil and Air Temperature at Three Locations in Puerto Rico, 1963-67”. The Journal of Agriculture of the University of Puerto Rico 56, no. 3 (July 1, 1972): 307–317. Accessed April 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10837.