Luu Quy Khuong, and Luu Ngoc Bao Thi. “Lexical Complexity of IELTS Academic Writing Task 2 Model Answers at Band Score 6”. Journal of English Language Teaching and Applied Linguistics 7, no. 2 (May 24, 2025): 119–126. Accessed August 5, 2025. https://al-kindipublishers.org/index.php/jeltal/article/view/9708.