United States. National Park Service. Rivers, Trails, and Conservation Assistance Program, & Porter, B. (2001). Economic benefits of conserved rivers: An annotated bibliography. National Park Service.
Chicago Style (17th ed.) CitationUnited States. National Park Service. Rivers, Trails, and Conservation Assistance Program, and Beth Porter. Economic Benefits of Conserved Rivers: An Annotated Bibliography. [Washington, D.C.]: National Park Service, 2001.
MLA (9th ed.) CitationUnited States. National Park Service. Rivers, Trails, and Conservation Assistance Program, and Beth Porter. Economic Benefits of Conserved Rivers: An Annotated Bibliography. National Park Service, 2001.
Warning: These citations may not always be 100% accurate.