Não informado. (1955). Forest pest leaflet. U.S. Department of Agriculture, Forest Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Forest Pest Leaflet. Washington: U.S. Department of Agriculture, Forest Service, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Forest Pest Leaflet. U.S. Department of Agriculture, Forest Service, 1955.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.