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..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited 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.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited 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.