Paray Theo Lonando, P. T. L., Firdaus, A. and Hakim, R. (2024) “Designing A Web Information System In The Guest Book Using The Waterfall Method At Ikest Muhammadiyah Palembang”, Journal Health Applied Science and Technology, 2(2), pp. 173–177. doi: 10.52523/jhast.v2i2.67.