Maukar, A. L., D. A. Kesuma, and A. A. Widodo. “Application of Waterfall-System Development Life Cycle Methodology for Designing Purchase Order Material Control System ”. Inform : Jurnal Ilmiah Bidang Teknologi Informasi Dan Komunikasi, Vol. 8, no. 2, May 2023, pp. 102-10, doi:10.25139/inform.v8i2.5138.