Não informado. (1951). Cooperative economic insect report. U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Cooperative Economic Insect Report. Washington: U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division, 1951.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Cooperative Economic Insect Report. U.S. Department of Agriculture, Agricultural Research Service, Plant Protection Division, 1951.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.