Lee, Ming Foong, Siti Nursaadah Mat Yusoff, King Hyiang Tan, and & Johnson Soon Chong Lim. 2019. “Needham Model Based Instructional Multimedia Material for Teaching Digital Logic Gates”. Journal of Technical Education and Training 11 (1). https://penerbit.uthm.edu.my/ojs/index.php/JTET/article/view/3063.