SJ Penson, GE Hollis, Thompson, Hydrology of the River BasinIn: Hollis, GE and Adams, WM and Aminu-Kano, M, (eds.) The Hadejia Nguru Wetlands: Environment, Economy and Sustainable Development of a Sahelian Floodplain Wetland. (pp. 19-68). IUCN: Gland & Cambridge. (1993). ,(1993)