1. 1. Houstond.f (1972) Rice Chemistry And Technology. American Association of Cereal Chemistry, Minnesite, pp. 301-340.
   2. Jackson n., (1988) Civil Engineering Materials. 3rd Edition London: Macmillan.
   3. Neville A. M., (1987) Concrete Technology 4th Edition Great Britain: Pitman Books.
   4. Olutoge, F.A (1994) The manufacture on concrete using rice husk ash as a partial substitute for cement”. Proceedings of Manufacturing Engineering Conference, Nigeria Institute of Industrial Engineers (NIIE), Conference Center U.I November 1999. Pp. 1- 12.
   5. SergiusMogulis, (2009): Studies on the Chemical Composition of Bone Ash Retrieved on Sept. 2009. From www.jbc.
   6. Troxell G.E., (1986): Composition and Properties of Concrete 2nd edition. Singapore; McGraw-Hill Book.