Esra E. Aleisa,  Developing Efficient Testing and Unloading Procedures for a Local Sewage Holding Pit.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2008, vol. 16(4). 79 - 85
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/13834.