Arip, Alisha Javrylnna, and Harwati Hashim. “Gamification in English As Second Language (ESL) Learning: A Systematic Review”. International Journal of Academic Research in Progressive Education and Development 13, no. 4 (December 10, 2024). Accessed July 8, 2025. https://ijarped.com/index.php/journal/article/view/3232.