Mohamad Zain, S. (2005) “Makalah Jemputan/Invited Article: Sains Matematik dan Pengurusan”, Journal of Quality Measurement and Analysis, 1(1), pp. 1–45. Available at: https://jqma.ukm.my/index.php/jqma/article/view/2 (Accessed: 6 December 2025).