Cordero, R. A., and B. Molano-Flores. “Germination of <i>Tabebuia heterophylla</i> Seeds (Bignoniaceae) from a Wet and Dry Forest of Puerto Rico”. Revista De Biología Tropical, vol. 44, no. 3A, Dec. 1996, pp. 79–86, https://revistas.ucr.ac.cr/index.php/rbt/article/view/21984.