Zainol Abidin, M. K., and A. Ismail. “Developing A 3D Action-Adventure Game Called ‘Code - E’ for Learning C++ Function Codes”. Journal of ICT in Education, vol. 8, no. 3, Dec. 2021, pp. 13-26, doi:10.37134/jictie.vol8.sp.1.2.2021.