Purba, Ines Adewinda, Dadang Surjasa, and Dian Mardi Safitri. “The Influence of Service Quality on Customer Satisfaction in Maintaining Loyalty at Coco SPBU in Medan City”. Operations Excellence: Journal of Applied Industrial Engineering 16, no. 2 (August 13, 2024): 123–134. Accessed June 3, 2026. https://publikasi.mercubuana.ac.id/index.php/oe/article/view/28306.