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 (Sep. 2024), 173–177. DOI:https://doi.org/10.52523/jhast.v2i2.67.