Rahmatul Ahya, Suprapto Suprapto, and Jhodi Pratama. “Analisis Kualitas Pelayanan Dengan Metode Importance Performance Analysis (IPA) Dan Costumer Satisfaction Index (CSI) Terhadap Kepuasan Konsumen : Studi Kasus Something Barbershop Sragen”. Journal of Business, Finance, and Economics (JBFE) 4, no. 2 (November 3, 2023): 72–89. Accessed November 24, 2024. https://journal.univetbantara.ac.id/index.php/jbfe/article/view/4655.