APA (7th ed.) Citation

Perkey, A. W., Miller, G. W., & Feicht, D. L. (2011). Coopers Rock Crop Tree Demonstration Area, 20-year results. United States Dept. of Agriculture, Forest Service, Northern Research Station.

Chicago Style (17th ed.) Citation

Perkey, Arlyn W., Gary W. Miller, and David L. Feicht. Coopers Rock Crop Tree Demonstration Area, 20-year Results. Newtown Square, PA: United States Dept. of Agriculture, Forest Service, Northern Research Station, 2011.

MLA (9th ed.) Citation

Perkey, Arlyn W., et al. Coopers Rock Crop Tree Demonstration Area, 20-year Results. United States Dept. of Agriculture, Forest Service, Northern Research Station, 2011.