Edland, T. 1990 [Exotic pests (3). San Jose scale Quadraspidiotus perniciosus (Comstock) - a dangerous pest of many plants.] Utanlandske skadedyr (3). San Jose skjoldlus Quadraspidiotus perniciosus (Comstock) - ein farleg skadegjerar pa mange planter.. Gartneryrket 80(8-9): 19-22.

Notes: With special reference to its importance as a potential quarantine pest of fruit crops in Norway and elsewhere, a review is presented of the world distribution, food plants, recognition, biology, injuriousness, natural enemies and control of Quadraspidiotus perniciosus.