Knetsch, J. L. (1974). Outdoor recreation and water resources planning. American Geophysical Union.
Lua i Stíl Chicago (17ú heag.)Knetsch, Jack L. Outdoor Recreation and Water Resources Planning. Washington: American Geophysical Union, 1974.
Lua MLA (8ú heag.)Knetsch, Jack L. Outdoor Recreation and Water Resources Planning. American Geophysical Union, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.