Não informado. (1999). Missouri geological survey and water resources. Tribune Printing.
Chicago-referens (17:e uppl.)Não informado. Missouri Geological Survey and Water Resources. Jefferson City, Mo: Tribune Printing, 1999.
MLA-referens (8:e uppl.)Não informado. Missouri Geological Survey and Water Resources. Tribune Printing, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.