Sari, Dita Lupita, and Choirun Niswatin. “System Requirement Analysis for E-Learning Materials to Support Academic Writing Skills for Engineering Students of Vocational Higher Education”. Jurnal Pendidikan Vokasi 8, no. 1 (February 28, 2018): 33–39. Accessed May 9, 2025. https://journal.uny.ac.id/index.php/jpv/article/view/17043.