Virkki, Niilo, Wilfredo Figueroa, and Julia M. Sepúlveda. 1989. “HOWARDULA SP., A NEMATODE NEW FOR PUERTO RICO, PARASITIZING A PARTHENOGENETIC SWEET POTATO-ASSOCIATED FLEA BEETLE, CHAETOCNEMA PERPLEXA BLAKE”. The Journal of Agriculture of the University of Puerto Rico 73 (2):171-74. https://doi.org/10.46429/jaupr.v73i2.6421.