Fadil Ramadhan, Suhanda Saputra, Rivaldi Hidayatullah, and Daffa Aulia Isham. “Perancangan Sistem Informasi Penjualan Es Kristal Berbasis Mobile Menggunakan Flutter Dan Model Waterfall Di CV. Panca Esss Utama”. BIN : Bulletin Of Informatics, vol. 2, no. 2, July 2024, pp. 187-95, https://ojs.jurnalmahasiswa.com/ojs/index.php/bin/article/view/349.