Irizarry, H., and J. Vélez Fortuño. “Effect of Gamma Radiation Dosages on Rooting of Pineapple Crown Sections, Shoot Emergence and Growth”. The Journal of Agriculture of the University of Puerto Rico 54, no. 3 (July 1, 1970): 551–558. Accessed June 28, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/10991.