Tran, Dung. 《Extracurricular Activities in English Language Teaching as a Pathway to Sustainable Development Goal 4 in Higher Education》. 知识学习与科学技术期刊 ISSN:2959-6386(在线) 5, no. 1 (三月 25, 2026): 32–45. 见于 九月 7, 2026. https://jklst.org/index.php/home/article/view/378.