Karthikeyan, P., A.M. Abirami, and M. Thangavel. “Enhancing Learner Engagement in Online Education through ADDG9E Model”. Journal of Engineering Education Transformations 37 (June 6, 2025): 54–61. Accessed December 5, 2025. https://journaleet.in/index.php/jeet/article/view/2306.