Oon-Seng Tan,  Problem-based Learning Approach to Human Computer Interaction.   journal   = {International Journal of Psychological and Behavioral Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2011, vol. 52(4). 356 - 359
    [viewed 19 February 2020]. Available from: https://publications.waset.org/pdf/3006.