Martin, F. W., E. Cabanillas, and M. H. Gaskins. “Economics of the Sapogenin-Bearing Yam As a Crop Plant in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 50, no. 1 (January 1, 1966): 53–64. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/3441.