Habib, A., & Atallah, Y.H. 1960 Population studies on the black scale, Chrysomphalus ficus Ashmead. III. the build up of the population on different kinds of citrus (Homoptera: Coccoidea).. Bulletin de la Société Entomologique d'Egypte 44: 353-365.

Notes: The degree of infestation was compared among 9 different citrus hosts.