Hepperly, Paul R. “Sorghum Rust. III. Losses in Hybrids under Semi-Arid Conditions”. The Journal of Agriculture of the University of Puerto Rico 75, no. 3 (July 1, 1991): 233–240. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/3591.