• Toprak, U., Gürkan, M.O. 2004. First record of a NPV isolated from Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) in Turkey and its molecular identification according to the partial lef-8 gene. Turkish Journal of Biology, 28:71-77.
• Toprak, U., Gürkan, M.O. 2004. Negative effects of pesticides to environment and human beings. Green World, 2:16-17.