Sari Mahibatus Saniyah. “Duolingo and Learner Autonomy: Investigating The Role of Personalization and Gamification in Promoting Self-Directed Language Learning”. ENJEL: English Journal of Education and Literature, vol. 2, no. 02, Dec. 2023, pp. 141-7, doi:10.30599/enjel.v2i02.529.