Oakes, A. J. “GERMINATION OF ELEPHANT GRASS (PENNISETUM PURPUREUM SCHUM.)”. The Journal of Agriculture of the University of Puerto Rico 43, no. 2 (April 1, 1959): 140–140. Accessed July 17, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12553.