Yulianto, Budi, Harjanto Prabowo, and Raymond Kosala. “Comparing the Effectiveness of Digital Contents for Improving Learning Outcomes in Computer Programming for Autodidact Students”. Journal of e-Learning and Knowledge Society 12, no. 1 (January 25, 2016). Accessed April 20, 2024. https://www.je-lks.org/ojs/index.php/Je-LKS_EN/article/view/1081.