Coba jelasin Lihat juga dari Mata air dalam bahasa melayu dong

Springs of Missouri, Vineyard and Feder, Missouri Department of Natural Resources, Division of Geology and Land Survey in cooperation with U.S. Geological Survey and Missouri Department of Conservation, 1982

Cohen, Stan (Revised 1981 edition), Springs of the Virginias: A Pictorial History, Charleston, West Virginia: Quarrier Press.