Não informado. (2001). Annual report of the forest insect survey. Department of Agriculture, Division of Entomology.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Forest Insect Survey. Ottawa: Department of Agriculture, Division of Entomology, 2001.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Forest Insect Survey. Department of Agriculture, Division of Entomology, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.