Fawaidul Badri, R. Maulana, K. Khotimah, R. P. N. Budiarti, and A. Andhyka. “Design and Build a Web App-Based Conference Registration System Using the Waterfall Model”. Applied Technology and Computing Science Journal, vol. 4, no. 2, May 2022, pp. 119-27, doi:10.33086/atcsj.v4i2.2820.