Lestari, Vivi Ayu, Ahmad Najib Mutawally, Arif Budimansyah Purba, Wafiqah Yasmin, Anwar Hilman, Wahyudi Wahyudi, and Ludovikus Ludovikus. “A Comparative Study Of Student Perceptions On Vocabulary Learning Using Duolingo And Elsa”. Journal of Innovative and Creativity 5, no. 2 (July 25, 2025): 15055–15064. Accessed October 16, 2026. https://joecy.org/index.php/joecy/article/view/595.