Srinivasan Latha and  M. R. Christhu Raj and  Rajeev Sukumaran,  Use of Visualization Techniques for Active Learning Engagement in Environmental Science Engineering Courses.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 112(4). 1340 - 1344
    [viewed 19 April 2021]. Available from: https://publications.waset.org/pdf/10004444.