WASET
    K. M. Oba,  Optimization of Transportation Cost of Plaster of Paris Cement.   journal   = {International Journal of Structural and Construction Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2024, vol. 205(1). 17 - 20
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10013466.