Sotomayor-Ramírez, David, Agenol González-Vélez, and Elvin Román-Paoli. 2003. “Yam (Dioscorea spp.) Response to Fertilization in Soils of the Semiarid Southern Coast of Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 87 (3-4):91-103. https://doi.org/10.46429/jaupr.v87i3-4.1101.