Não informado. (1999). Missouri geological survey and water resources. Tribune Printing.
Chicago-Zitierstil (17. Ausg.)Não informado. Missouri Geological Survey and Water Resources. Jefferson City, Mo: Tribune Printing, 1999.
MLA-Zitierstil (8. Ausg.)Não informado. Missouri Geological Survey and Water Resources. Tribune Printing, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.