Hill, K.E. (1987), Diagram drawing, British Journal of Visual Impairment, V, 1,28 (Letter to the Editors).
2.
Hill, K.E. and Jurmang, I.J. (1993), Production and adaptation of local material for the teaching of science and mathematics to the visually handicapped; in Education of the exceptional child in the 21st century: tasks and strategies, E.D. Ozoji and I.K. Nwuzuoke (Eds.), National Council for the Exceptional Child, Nigeria.