Schalla, A. (1999). Water supply and sewage disposal of the Nigerian society in the Ogun River Basin: A geographical case study of human usage and management of the water resources in a tropical lowland area. Kovač.
Chicago-Zitierstil (17. Ausg.)Schalla, Andrea. Water Supply and Sewage Disposal of the Nigerian Society in the Ogun River Basin: A Geographical Case Study of Human Usage and Management of the Water Resources in a Tropical Lowland Area. Hamburg: Kovač, 1999.
MLA-Zitierstil (9. Ausg.)Schalla, Andrea. Water Supply and Sewage Disposal of the Nigerian Society in the Ogun River Basin: A Geographical Case Study of Human Usage and Management of the Water Resources in a Tropical Lowland Area. Kovač, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.