N. Ismail and  O. Thammajinda and  U. Thongpanya,  Identifying Game Variables from Students’ Surveys for Prototyping Games for Learning.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2019, vol. 149(5). 543 - 552
    [viewed 12 November 2019]. Available from: https://publications.waset.org/pdf/10010319.