United States. Forest Service. Pacific Northwest Region. (2005). Pacific Northwest Region invasive plant program: Preventing and managing invasive plants record of decision. USDA Forest Service, Pacific Northwest Region ; U.S. G.P.O..
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)United States. Forest Service. Pacific Northwest Region. Pacific Northwest Region Invasive Plant Program: Preventing and Managing Invasive Plants Record of Decision. Portland, OR : [Washington, D.C.]: USDA Forest Service, Pacific Northwest Region ; U.S. G.P.O., 2005.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)United States. Forest Service. Pacific Northwest Region. Pacific Northwest Region Invasive Plant Program: Preventing and Managing Invasive Plants Record of Decision. USDA Forest Service, Pacific Northwest Region ; U.S. G.P.O., 2005.