WASET
    J. E. Oti and  J. M. Kinuthia and  R. Robinson and  P. Davies,  The Use of Palm Kernel Shell and Ash for Concrete Production.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 99(3). 263 - 270
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10000699.