Pennock, William. “The Testing and Scoring of Some Avocado Varieties and New Selections on Their Behavior Under Refrigeration”. The Journal of Agriculture of the University of Puerto Rico 43, no. 1 (January 1, 1959): 34–49. Accessed November 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12542.