1. Blackburn T. M. 1990 Comparative and experimental studies of animal life histories. D. Phil. thesis University of Oxford.
2. Phylogeny of the Aculeata: Chrysidoidea and Vespoidea (Hymenoptera);Brothers D. J.;J. Hym. Res.,1993
3. Brown W. L. Jr 1982 Hymenoptera. In Synopsis and classi¢cation of living organisms (ed. S. P. Parker) pp. 652^68. New York: McGraw-Hill.
4. Clausen C. P. 1940 Entomophagous insects. New York: McGraw-Hill.
5. Clausen C. P. (ed.) 1977 Introduced parasites and predators of arthropod pests and weeds: a world review. USDA Agric. Handbook 480 551 pp.