Penerapan Model Waterfall Pada Sistem Informasi Pembayaran SPP dan Pengisian Rapor SMK Muhammadiyah 13. rpts [Internet]. 2024 Jun. 20 [cited 2025 May 15];4(2):89-95. Available from: https://jurnal.bsi.ac.id/index.php/reputasi/article/view/2416