Pérez López, Agripino. “Effects of Scarification and Gibberellic Acid on Germination of Congo Watermelon Seed”. The Journal of Agriculture of the University of Puerto Rico 45, no. 3 (July 1, 1961): 182–187. Accessed December 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/13752.