Mahbub MA, Romsi A, Bulqiyah S, Firdaus IA. INFUSING A GAMIFICATION MECHANISM THROUGH DUOLINGO FOR ENGLISH SPEAKING PROFICIENCY: PERCEPTIONS OF THE INDONESIAN EFL INSTRUCTOR AND STUDENTS. konstruk [Internet]. 2020Jan.31 [cited 2024Nov.27];12(1):69-0. Available from: https://ejournal.unisbablitar.ac.id/index.php/konstruktivisme/article/view/894