WASET
    Brittany E. Coff and  Tommy K. K. Ngai and  Laura A. S. MacDonald,  A Practical Methodology for Evaluating Water, Sanitation and Hygiene Education and Training Programs.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 113(5). 548 - 551
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10004419.