Nawi, A., N. Zainuddin, and L. Abd Rahman. “The Application of Nominal Group Technique (NGT) in Evaluating the Usability of E-Learning”. International Online Journal of Language, Communication, and Humanities, Vol. 4, no. 2, Oct. 2021, pp. 114-33, http://insaniah.umk.edu.my/journal/index.php/insaniah/article/view/121.