1. Bedford, E. C. G. 1968. An integrated spray programme. S. Afr. Citrus J., No. 417, pp. 9–28.
2. Broodryk, S. W., and R. L. Doutt. 1966. The biology of Coccophagoides utilis Doutt (Hymenoptera: Aphelinidae). Hilgardia 37: 233–254.
3. Clausen, C. P. (Editor) In preparation. Biological Control of Insect Pests and Weeds-A Review. (1970)
4. Compere, H. 1955. A systematic study of the genus Aphytis Howard (Hymenoptera, Aphelinidae) with descriptions of new species. Univ. Calif. Publ. Entomol. 10: 271–319.
5. Compere, H. 1961. The red scale and its insect enemies. Hilgardia 31: 173–378.