Felt, E.P. 1924 . Manual of Tree and Shrub Insects. MacMillan New York 382 pp.

Notes: General information on insects; 18-page chapter on scale insects includes key, brief field descriptions and control recommendations for Lepidosaphes ulmi, Chionaspis furfura, C. euonymi, C. pinifoliae, Aspidiotus perniciosus, A. ancylus, A. juglans-regiae, A. abietis, Pseudaonidia, Gossyparia spuria, Eulecanium corni, P. vitis, Pulvinaria acericola, Phenacoccus acericola, Eulecanium nigrofasciatum, Toumeyella liriodendri, Neolecanium cornuparvum, Aulacaspis rosae, Chrysomphalus obscurus, Asterolecanium variolosum, Eriococcus azaleae, Diaspis carueli, Pseudophilippia quaintancii and Physokermes piceae.