Harahap, R. D., and M. Sadikin. “Penerapan Metode First In First Out Pada Sistem Self Service E-Order Berbasis QR Code”. RIGGS: Journal of Artificial Intelligence and Digital Business, vol. 4, no. 4, Nov. 2025, pp. 2050-6, doi:10.31004/riggs.v4i4.3834.