Ranti Maulya. “Increasing Student’s Motivation in Learning English Using Duolingo”. Jurnal Bima : Pusat Publikasi Ilmu Pendidikan bahasa dan Sastra 1, no. 3 (August 29, 2023): 200–206. Accessed January 15, 2025. https://journal.aripi.or.id/index.php/Bima/article/view/116.