Penzig, O. 1887 . Studi Botanici sugli Agrumi e sulle Piante Affini. [Botanical Studies of Citrus and its Related Plants.] Annali di Agricoltura Rome 590 pp.

Notes: Scale species reviewed include Aspidiotus ficus, A. nerii, A. limoni, Aonidia gennadii, Diaspis monserrati, D. colvei, Chionaspis citri, Mytilaspis citricola, M. gloverii, Parlatoria lucasii, P. pergandii, Ceroplastes floridensis, C. cirrhipediformis, C. rusci, Lecanium hesperidum, Lecanium oleae, L. hemisphaericum, Dactylopius citri and Icerya purchasi. Descriptions, biological notes and descriptions of damage to citrus given.