Herlambang, Admaja Dwi, Lutfiani Akhmadi, and Satrio Hadi Wijoyo. “Interactive Digital Book Development for Computer and Network Fundamental Teaching Subject Based on Four - D Model at Indonesian Computer and Network Engineering Vocational High School”. Journal of Information Technology and Computer Science 4, no. 2 (September 30, 2019): 156–165. Accessed August 16, 2022. https://jitecs.ub.ac.id/index.php/jitecs/article/view/118.