Não informado. (1951). Cooperative economic insect report. U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division.
Chicago-referens (17:e uppl.)Não informado. Cooperative Economic Insect Report. Washington: U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division, 1951.
MLA-referens (8:e uppl.)Não informado. Cooperative Economic Insect Report. U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.