Ahmad Rifa’i and Luthfi, A. 2025. Analysis of the Effectiveness of User Manual Book in Supporting Application Usage at PT KPI RU 5 - Balikpapan. Journal of Software Engineering Ampera. 5, 1 (Feb. 2025), 1–21. DOI:https://doi.org/10.51519/journalsea.v5i1.565.