Hu, Zixuan, Chawin Srisawat, and Kornwipa Poonpon. “Lexical Richness and Academic Writing Performance in a Thai University Academic English Test”. Journal of Studies in the English Language 21, no. 2 (August 31, 2026): 89–113. accessed September 2, 2026. https://so04.tci-thaijo.org/index.php/jsel/article/view/291653.