Ginting YM, Chandra T, Oktariyanto O, Endrawati E. A Study Of Servqual And Customer Satisfaction Using Customer Satisfaction Index (Csi), Importance Performance Analysis (Ipa) And Improvement Factor (If) Method. ecotal [Internet]. 2023 Dec. 24 [cited 2026 Mar. 27];5(1):373-9. Available from: https://ojs.stieamkop.ac.id/index.php/ecotal/article/view/738