1. S. Akhtar (1990 ).The effect of the systemic fungicide benomyl on bird cherry aphid(Rhopalosiphum padi)and on the symbionts and mycetocytes. Ph.D. Thesis , University of Reading.200 pp.
2. Some effects of benomyl and carbendazim on Aphis fabae and Acyrthosiphon pisum on field bean (Vicia faba)
3. E. S. Binns (1970 ). Aphicidal activity on benomyl .Glasshouse Crops Research Station Annual Report 1969, p.113 .
4. The Intrinsic Rate of Natural Increase of an Insect Population
5. P. Buchner (1965 ). Endosymbiosis of animals with plant microorganisms . New York: Interscience. 901 pp.