Não informado. (1959). Cooperative Groundwater Report. State Geological Survet, State Water Survey.
Chicago-Zitierstil (17. Ausg.)Não informado. Cooperative Groundwater Report. Champaign, Ill: State Geological Survet, State Water Survey, 1959.
MLA-Zitierstil (8. Ausg.)Não informado. Cooperative Groundwater Report. State Geological Survet, State Water Survey, 1959.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.