Muhammad Yusuf, and Barany Fachri. “Sistem Informasi Penjualan Kartu Dan Voucher Internet Berbasis Web Menggunakan Metode Waterfall”. Bulletin of Computer Science Research 4, no. 5 (August 31, 2024): 388-397. Accessed June 8, 2026. https://hostjournals.com/bulletincsr/article/view/364.