XU, Liang. The Age Effect in Second Language Acquisition and Its Study Design Method . Journal of Education, Humanities and Social Sciences, [S. l.], v. 8, p. 1215–1222, 2023. DOI: 10.54097/ehss.v8i.4454. Disponível em: https://drpress.org/ojs/index.php/EHSS/article/view/4454. Acesso em: 10 jun. 2026.