“ENHANCING VOCABULARY RETENTION THROUGH GAMIFIED LEARNING: EVIDENCE FROM VIETNAMESE EFL SECONDARY CLASSROOMS”. The International Journal of Language Studies (ISSN : 3078 - 2244) 2, no. 2 (May 10, 2025): 111–128. Accessed October 19, 2025. https://ijlangstudies.org/index.php/home/article/view/v2.n2.011.