APA (7th ed.) Citation

United States. Forest Service. (2004). Bark beetles-they're back: Are your trees at risk? USDA, Forest Service.

Chicago Style (17th ed.) Citation

United States. Forest Service. Bark Beetles-they're Back: Are Your Trees at Risk? [Washington, D.C.]: USDA, Forest Service, 2004.

MLA (9th ed.) Citation

United States. Forest Service. Bark Beetles-they're Back: Are Your Trees at Risk? USDA, Forest Service, 2004.