Abbas, M. F. F. ., and T. R. W. . Ningsih. “Investigating Self-Assessment Integrated into E-Portfolio in a Writing Activity”. Proceeding of International Conference on Language Pedagogy (ICOLP), vol. 2, no. 1, Dec. 2022, pp. 179-90, https://proceeding-icolp.fbs.unp.ac.id/index.php/icolp/article/view/88.