APA (7th ed.) Citation

Shifley, S. R. (2012). Forests of the northern United States. USDA Forest Service, Northern Research Station.

Chicago Style (17th ed.) Citation

Shifley, Stephen R. Forests of the Northern United States. Newtown Square, Pennsylvania: USDA Forest Service, Northern Research Station, 2012.

MLA (9th ed.) Citation

Shifley, Stephen R. Forests of the Northern United States. USDA Forest Service, Northern Research Station, 2012.

Warning: These citations may not always be 100% accurate.