1. A.T. Bourgoyne, K.K. Millheim, M.E. Chenevert, F.S. Young, Applied Drilling Engineering. Richardson, TX, 1991; 2nd Printing, Society of Petroleum Engineers.
2. E.A. Okorie, N.O. Anietie, D.U. Francis, A Review of Nigerian bentonitic clays as Drilling Mud. Society of Petroleum Engineers, 2015; SPE-178264-MS. Information on https://doi.org/10.2118/178264-MS.
3. A. Akinade, F. Afolabi, Experimental Investigation of the use of local clay (Abbi, Delta State, Nigeria) as a substitute for Foreign Imported Bentonite clay in the Formulation of Aqua base Drilling Fluid. Int. J. Sci. Eng. Res., 2015; 6 (6): 1138–1143.
4. J.F. Akinfolarin, O.O. Awopetu, The Effect of Sawdust on the Insulating Effect of Ikere clay as Refractory Lining. AU Journal of Technology, 2014; 17(3): 143-147.
5. U.E. Ekpunobi, C.B. Duru, A.S. Ogbuagu, F.O. Obumselu, Analysis and Characterization of clay deposit in Idemili River, South Eastern Nigeria. Pelagia Research Library, 2013; 4(3): 6-9.