Lee, Ming Foong, Siti Nursaadah Mat Yusoff, King Hyiang Tan, and & Johnson Soon Chong Lim. “Needham Model Based Instructional Multimedia Material for Teaching Digital Logic Gates”. Journal of Technical Education and Training 11, no. 1 (March 17, 2019). Accessed July 7, 2022. https://publisher.uthm.edu.my/ojs/index.php/JTET/article/view/3063.