Anita Kéri,  Developing a Customizable Serious Game and Its Applicability in the Classroom.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2019, vol. 149(5). 553 - 560
    [viewed 18 October 2019]. Available from: https://publications.waset.org/pdf/10010326.