Doan, Van Kieu. 2025. 《Using Shadowing Technique to Improve English-Majored Sophomores’ English Speaking Skills at Hanoi University of Natural Resources and Environment》. 知识学习与科学技术期刊 ISSN：2959-6386（在线） 4 (3): 55–71. https://doi.org/10.60087/jklst.vol4.n3.005.