Miller, Fred, and A. Sierra-Bracero. “SORGHUM HALAPENSE AND S. VERTICILLIFLORUM IN SOUTH-WESTERN PUERTO RICO”. The Journal of Agriculture of the University of Puerto Rico 56, no. 4 (October 1, 1972): 442–444. Accessed October 5, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/10808.