Dexter Sigan John , Chuah Kee Man , Keezrawati Mujan Yusuf. 2020. “Challenge-Based Assessments in a Gamified Learning Environment: A Case Study on Linguistics Students”. International Journal of Advanced Science and Technology 29 (10s), 542 -49. http://sersc.org/journals/index.php/IJAST/article/view/14465.