Chen, Peayton, Rita Kuo, Maiga Chang, and Jia-Sheng Heh. “The Effectiveness of Using in-Game Cards As Reward”. Research and Practice in Technology Enhanced Learning 12 (August 1, 2017). Accessed November 25, 2024. https://rptel.apsce.net/index.php/RPTEL/article/view/2017-12015.