Wardana, Acmad Bayu, and Wiwik Sumarmi. “Measurement of Consumer Satisfaction of Product Quality Using the Customer Satisfaction Index Method and Importance Performance Analysis: Pengukuran Kepuasan Konsumen Terhadap Kualitas Produk Menggunakan Metode Customer Satisfaction Index Dan Importance Perfomance Analysis”. Indonesian Journal of Innovation Studies 6 (April 3, 2019). Accessed May 31, 2025. https://ijins.umsida.ac.id/index.php/ijins/article/view/132.