Emirza, Ferizka, and Mohamad Sahril. “AN INVESTIGATION OF ENGLISH SPEAKING SKILLS PERFORMANCE OF INTROVERT STUDENTS IN SPEAKING CLASS”. ENGLISH JOURNAL 15, no. 1 (March 31, 2021): 10–17. Accessed February 22, 2025. http://360665.5mvk4.group/index.php/ENGLISH/article/view/4558.