Não informado. (1955). Forest pest leaflet. U.S. Department of Agriculture, Forest Service.
Chicago-viite (17. p.)Não informado. Forest Pest Leaflet. Washington: U.S. Department of Agriculture, Forest Service, 1955.
MLA-viite (8. p.)Não informado. Forest Pest Leaflet. U.S. Department of Agriculture, Forest Service, 1955.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.