1. Md. Abdul Mannan, A study on the use of oil palm shell in lightweight concrete, PhD Thesis. Sabah: University of Malaysia 2001.
2. ASTM C330-89, Standard specification for lightweight aggregates for structural concrete, Annual Book of ASTM Standards.
3. BS1881. Part 116. Method for determination of compressive strength of concrete cubes. London: British Standard Institution.
4. ASTM C469-87a. Standard test method for static modulus of elasticity and poissons ratio of concrete in compression. Annual Book of ASTM Standards.
5. ASTM C496-90. Standard test method for splitting tensile strength of cylindrical concrete specimens. Annual Book of ASTM Standards.