Early, Dwi Rahmayani, and Alhuda Alhuda. “Design an Alumni Data Collection Information System Using the Waterfall Method”. Knowbase : International Journal of Knowledge in Database 2, no. 2 (October 15, 2022): 130–141. Accessed May 7, 2026. https://ejournal.uinbukittinggi.ac.id/index.php/ijokid/article/view/5855.