Tundys , Blanka, and Fernando Yudi. “Sustainable Supply Chain Management - Key Performance Indicators (KPI) As an Element for Measuring of Processes”. Transport Economics and Logistics 83 (September 17, 2019): 31–50. Accessed May 4, 2024. https://czasopisma.bg.ug.edu.pl/index.php/znetil/article/view/5385.