1. Anonymous, 1998. Vegetables. Annual Summary. U.S. Department of Agriculture. National Agricultural Statistics Service. [Online] July 14, 2009. Available: http://usda.mannlib.cornell.edu/usda/nass/VegeSumm//1990s/1998/VegeSumm-01-16-1998.txt.
2. Recognizing Economically Important Caterpillars of Pacific Northwest Row Crops;Antonelli,2000
3. Evidence of northerly dispersal of the sunflower moth by warm winds;Arthur;Environ. Entomol.,1981
4. Pest insects of annual crops in Canada. I. Lepidoptera II Diptera III Coleoptera;Beirne;Memoirs Ent. Soc. Canada,1971
5. Monarch butterfly orientation: missing pieces of a magnificent puzzle;Brower;J. Exp. Biol.,1996