Sen, B. K., Khong, W. K., Lee, S. H., Lim, B. L., Abdullah, M. R., Ting, C. N., & Wee, S. H. (1998). ZIPF’S LAW AND WRITINGS ON LIS. Malaysian Journal of Library and Information Science, 3(1), 93–98. Retrieved from https://adum.um.edu.my/index.php/MJLIS/article/view/6652