Nafisa, Hasna Anggun, and Erna Hudianti Pujiarini. “Integrated QR Code-Based Cafe Ordering With Point of Sale and Electronic Receipt”. Journal of Information Systems and Technology Research 5, no. 2 (May 31, 2026): 270–280. Accessed July 15, 2026. https://journal.aira.or.id/jistr/article/view/1552.