Yostian Ari Sujarwo, and Samidi. 2025. “Project Management and Cost Optimization in QR Code-Based Parking Reservation System Development: A PERT, Monte Carlo and PMBOK Approach”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi 16 (1). https://doi.org/10.31937/si.v16i1.4170.