Mathys, G., Guignard, E., & Stahl, J. 1965 L'identification des cochenilles du genre Quadraspidiotus importantes en arboriculture. [The identification of scales important to arboriculture of the genus Quadraspidiotus.]. Agriculture Romande 4 (Ser. A): 65-68.

Notes: [Subtitle: Quadraspidiotus perniciosus, Q. ostreaeformis, Q. piri, Q. marani and Q. lenticularis.]