Jin, Yinxing, Kees de Bot, and Merel Keijzer. “The Anxiety-Proficiency Relationship and the Stability of Anxiety: The Case of Chinese University Learners of English and Japanese”. Studies in Second Language Learning and Teaching 5, no. 1 (January 1, 2015): 41–63. Accessed December 6, 2022. https://pressto.amu.edu.pl/index.php/ssllt/article/view/3832.