Rabkin, F.B., & Lejeune, R.R. 1955 Some aspects of the biology and dispersal of the Pine Tortoise Scale, Toumeyella numismaticum (Pettit and McDaniel) (Homoptera: Coccidae).. Canadian Entomologist 86: 570-575.
Rabkin, F.B., & Lejeune, R.R. 1955 Some aspects of the biology and dispersal of the Pine Tortoise Scale, Toumeyella numismaticum (Pettit and McDaniel) (Homoptera: Coccidae).. Canadian Entomologist 86: 570-575.