González-Vélez, Agenol. “Yield and Natural Reaction to Anthracnose (Colletotrichum Gloeosponoides) of Four Yam Cultivars Planted Without Staking”. The Journal of Agriculture of the University of Puerto Rico, vol. 90, no. 1-2, Apr. 2006, pp. 75-81, doi:10.46429/jaupr.v90i1-2.2962.