Sanadgol, Fatemeh, and Seyed Jalal Abdolmanafi-Rokni. “The Relationship Between Language Learning Anxiety, Motivation, Autonomy and Language Proficiency of Iranian High School Students”. International Journal of English and Education, vol. 4, no. 1, Jan. 2015, pp. 369-77, https://ijee.org/ijee/article/view/926.