Supriadi, Etty Soesilowati, and Inayati Nuraini Dwiputri. 2026. “Optimizing the Service Profit Chain Model by Enhancing Job Satisfaction to Improve Customer Oriented Employee Performance at PDAM Kota Balikpapan”. Economics and Business Journal (ECBIS) 4 (5):2367-82. https://doi.org/10.47353/ecbis.v4i5.395.