Baggiolini, M., Geier, P., & Mathys, G. 1951 Contaminabilite par le pou de San José Quadraspidiotus perniciosus Comst.) des vegetaux ligneux les plus connus en Suisse. [Infestations by the San José scale (Quadraspidiotus perniciosus Comst.) on well-known woody plants in Switzerland].. Annuaire agricole de la Suisse 52: 931-937.

Notes: A long list of host plants is provided with comments.