1. Why there are so few species of aphids especially in the tropics?;Dixon;Am. Nat.,1987
2. Taxonomic issues;Blackman,2007
3. Arthropod Transmission of plant viruses: a new synthesis;Nault;Ann. Entomol. Soc. Am.,1997
4. Transmission of Plant Viruses;Katis,2007
5. J.P. Michaud, P.E. Sloderbeck, Russian Wheat Aphid: an introduced pest of small grains in the High Plains. Publication from Kansas State University Agricultural Experiment Station and Cooperative Extension Service (2005) http://www.ksre.ksu.edu/library/entml2/mf2666.pdf.