Blair, C.A, Blackith, R.E., & Boratyński, K.L. 1964 Variation in Coccus hesperidum L. (Homoptera: Coccidae).. Proceedings of the Royal Entomological Society of London (A) 39: 129-134.

Notes: Gives measurements of 18 structures in 27 individuals; discusses latent roots and vectors obtained from correlation matrix of characters.