S. Babaee and H. V. Borji, “The Role of Problem-Based Learning (PBL) E-portfolios on Writing Anxiety”, IJSBAR, vol. 36, no. 1, pp. 279–305, Sep. 2017, Accessed: Oct. 23, 2025. [Online]. Available: https://gssrr.org/JournalOfBasicAndApplied/article/view/7976