Zulkipli, Asroni O, Tahir M. Digital E-Book Development Using Any Flip to Improve Student Learning Outcomes on Firewall Materials. UJSSH [Internet]. 2024 Dec. 10 [cited 2025 Oct. 14];3(2):393-400. Available from: https://www.ujssh.com/index.php/ujssh/article/view/152