Risma Hardini, Hamid Muhammad Jumasa, Wahju Tjahjo Saputro. Sistem Informasi Penjualan di Koperasi Karyawan Surya Menggunakan Model Waterfall. intek [Internet]. 2022Nov.29 [cited 2024Nov.23];5(2):120-3. Available from: https://ebook.umpwr.ac.id/index.php/intek/article/view/2398