NGUYEN, Thi Quyen. An Investigation into the Effect of Using Duolingo to Enhance Students’ Vocabulary. AsiaCALL Online Journal, [S. l.], v. 16, n. 2, p. 1–31, 2025. DOI: 10.54855/acoj.251621. Disponível em: https://asiacall-acoj.org/index.php/journal/article/view/91. Acesso em: 27 nov. 2025.