Rodríguez, Rocío, and P. L. Meléndez. “Occurrence of Sphaeropsis Knot on Citron (Citrus Medica L.) in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico, vol. 68, no. 2, Apr. 1984, pp. 179-83, doi:10.46429/jaupr.v68i2.7276.