Frieyadie F. PENERAPAN MODEL WATEFALL PADA RANCANG BANGUN SISTEM INFORMASI PENJUALAN ONLINE HID BULLAES. jitk [Internet]. 2016Aug.15 [cited 2026Mar.3];2(1):1-4. Available from: https://www.ejournal.nusamandiri.ac.id.103-80-238-135.cpanel.site/index.php/jitk/article/view/226