Díaz-Rivera, Manuel, Paul R. Hepperly, Guillermo Riveros, and Luis Almodóvar-Vega. “Weed-Crop Competition in Pigeon Peas in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 69, no. 2 (April 1, 1985): 201–213. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7344.