Boneta García, Elvin G., and Ramón Bosque Lugo. “Yields of 16 Arabica-Type Coffee Varieties Grown Under Partial Shade and in Full Sunlight”. The Journal of Agriculture of the University of Puerto Rico 56, no. 4 (October 1, 1972): 337–342. Accessed April 24, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10797.