Pérez López, A., and R. Abrams. “Effects of Growth Regulators on the Rooting of Grape Cuttings”. The Journal of Agriculture of the University of Puerto Rico 44, no. 2 (April 1, 1960): 70–76. Accessed May 8, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12095.