Utomo, Muhammad Nur Yasir, Eddy Tungadi, and Widya Khartika. “Enhancing Web Performance for E-Learning Platform Using Content Delivery Network (CDN) and Varnish Cache”. Journal of Information Systems and Informatics 7, no. 1 (March 28, 2025): 831–847. Accessed March 7, 2026. https://www.journal-isi.org/index.php/isi/article/view/993.