González, Osvaldo, Francisco Vázquez, and Paul Hepperly. “SYMPTOMATOLOGY AND CONTROL OF SCION DIEBACK IN GRAFT-PROPAGATED COCOA (THEOBROMA CACAO L.)”. The Journal of Agriculture of the University of Puerto Rico 74, no. 2 (April 1, 1990): 207–208. Accessed April 24, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/6554.