1. Adepegba, D. (1975). “A comparative study of normal concrete with concrete which contained laterite instead of sand.” Building Science, Vol. 10, No. 2, pp. 135–141, DOI: 10.1016/0007-3628(75)90029-8 .
2. ASTM Standard C 1202-05 (2005). Standard test method for electrical indication of concrete’s ability to resist chloride ion penetration, ASTM Internationals, West Conshohocken, PA.
3. ASTM Standard C 150-05 (2005). Standard specification for Portland cement, ASTM Internationals, West Conshohocken, PA.
4. ASTM Standard C 494-05 (2005). Standard specification for chemical Admixtures for concrete, ASTM Internationals, West Conshohocken, PA.
5. Awal, A. S. M. (1998). A Study of Strength and Durability Performances of Concrete Containing Palm Oil Fuel Ash, Doctor Philosophy. Universiti Teknologi Malaysia, Skudai.