Não informado. (1940). Water Resources Review. U.S. Department of the Interior, Geological Survey.
Chicago-referens (17:e uppl.)Não informado. Water Resources Review. Reston, Va: U.S. Department of the Interior, Geological Survey, 1940.
MLA-referens (8:e uppl.)Não informado. Water Resources Review. U.S. Department of the Interior, Geological Survey, 1940.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.