Zulkipli, Ondi Asroni, and Muhammad Tahir. “Digital E-Book Development Using Any Flip to Improve Student Learning Outcomes on Firewall Materials”. Uniglobal Journal of Social Sciences and Humanities 3, no. 2 (December 10, 2024): 393–400. Accessed August 30, 2025. https://www.ujssh.com/index.php/ujssh/article/view/152.