Rodríguez, Saulo J., and Carlos Rivera-López. “The Performance of Pelargonium Stockplants in Different Potting Mixtures”. The Journal of Agriculture of the University of Puerto Rico 60, no. 2 (April 1, 1976): 224–227. Accessed June 30, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10574.