Weber, H. 1933 . Lehrbuch der Entomologie. [Textbook of Entomology.] Verlag von Gustav Fischer Jena 726 pp.

Notes: Scale species mentioned include Orthezia cataphracta, O. urticae, Pseudococcus citri, Lecanium oleae, L. hesperidum, L. corni and Aulacaspis rosae.