suwarti, indri. “PORTFOLIO AS AN AUTHENTIC ASSESSMENT INSTRUMENT IN WRITING INSTRUCTION: A LITERATURE REVIEW STUDY”. Proceeding of International Seminar on Humanity, Education, and Language 1, no. 1 (July 14, 2025): 325–339. Accessed May 19, 2026. https://journal.unj.ac.id/unj/index.php/ishel/article/view/57722.