Gill, R.J., Nakahara, S., & Williams, M.L. 1977 A review of the genus Coccus Linnaeus in America north of Panama (Homoptera: Coccoidea: Coccidae).. Occasional Papers in Entomology, State of California, Department of Food and Agriculture 24: 44.

Notes: Detailed study; key to species and three similar species in North America; redescription of 8 species; list of names used in genus Coccus.