Mattern, Frank, and William Pennock. “The Potential Market for Improved Varieties of Mangos in Puerto Rican Supermarkets”. The Journal of Agriculture of the University of Puerto Rico 55, no. 2 (April 1, 1971): 153–160. Accessed April 16, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/11045.