Lutfiah, Zumrotun, Riyadi Saputra, and Riandini Putri. “The Effect of Using the Duolingo Application on English Learning Outcomes of Third-Grade Students at SD Negeri 10 Sitiung”. TOFEDU: The Future of Education Journal 4, no. 7 (September 4, 2025): 3516–3522. Accessed September 29, 2025. http://journal.tofedu.or.id/index.php/journal/article/view/813.