WASET
    G. Malumbela and  E. U. Masuku,  Resources and Strategies towards the Development of a Sustainable Construction Materials Industry in Botswana.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 108 - 114
    [viewed 08 May 2024]. Available from: https://publications.waset.org/pdf/10006310.