Evaluation of Supplier Performance at PT. XYZ Using a Combined Method of Purchasing Portofolio Matrix (PPM) and Supplier Potential Matrix (SPM). G-Tech [Internet]. 2025 Apr. 18 [cited 2026 Oct. 4];9(2):968-77. Available from: https://ejournal.uniramalang.ac.id/g-tech/article/view/6822