Frieyadie, F., and U. Fatayat. “PENGGUNAAN MODEL WATERFALL DALAM PERANCANGAN APLIKASI PENJUALAN KOSMETIK BERBASIS WEB”. Jurnal Riset Informatika, vol. 1, no. 4, Oct. 2023, pp. 159-66, https://ejournal.kresnamediapublisher.com/index.php/jri/article/view/22.