Freeman Ntuli,  Management and Control of Industrial Effluents Discharged to Public Sewers: A Case Study.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 469 - 474
    [viewed 27 September 2021]. Available from: https://publications.waset.org/pdf/15355.