Chinchua, Siwalai, Thiyaporn Kantathanawat, and Somkiat Tuntiwongwanich. “Increasing Programming Self-Efficacy (PSE) Through a Problem-Based Gamification Digital Learning Ecosystem (DLE) Model”. Journal of Higher Education Theory and Practice 22, no. 9 (August 22, 2022). Accessed July 22, 2024. https://articlegateway.com/index.php/JHETP/article/view/5370.