1. Alkali, A. G. 1995. River-Aquifer Interaction in the Middle Yobe River Basin, North East Nigeria. PhD Thesis, Silsoe College, Cranfield University.
2. Vadose-zone techniques for estimating groundwater recharge in arid and semi-arid regions.;Soil Science Society of America Proceedings,,1994
3. BRGM. 1975. Notices Explicatives des Cartes de Planification pour ľExploitation des Eaux Souterraines de ľAfrique Sahelienne. Bureau de Recherches Geologiques et Minieres, France.
4. Carter, J. D, & Barber, W. 1958. The Rise in the Water Table in Paris of Potiskum Division, Bornu Province. Geological Survey of Nigeria 1956. Federation of Nigeria/Ministry of Mines and Power.
5. Carter, R. C. 1994a. Agro-Pastoral Adaptation to Environmental Change in Northeast Nigeria; Groundwater Issues. Report to Cambridge University/ESRC Research Project.