Rodríguez, Saulo J., and Jaime Jordán Molero. “ETHREL: A POTENTIAL COFFEE RIPENER”. The Journal of Agriculture of the University of Puerto Rico 54, no. 4 (October 1, 1970): 689–690. Accessed March 28, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10937.