Perancangan Sistem Informasi Administrasi Pembayaran SPP Berbasis WEB pada SMA PGRI Kragilan Menggunakan Model SDLC Waterfall. IPSSJ [Internet]. 2026 Sep. 13 [cited 2026 Oct. 21];3(09 September):268-80. Available from: https://ipssj.com/index.php/ojs/article/view/2006