A. D. Muhammad Lutfy and C. S. M. binti Muhammad Basri, “Online Ordering Systems: Development of Order Calculation using a Web-Based Calculator”, EKST, vol. 3, no. 1, pp. 135–142, Aug. 2023, Accessed: Jul. 18, 2024. [Online]. Available: https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/10289