González Ibáñez, Jaime. “The Use of Preemergence Herbicides for Weed Control Around Young Coffee Seedlings”. The Journal of Agriculture of the University of Puerto Rico 48, no. 1 (January 1, 1964): 25–31. Accessed April 24, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12970.