Darsono, L. I., and C. M. Junaedi. “An Examination of Perceived Quality, Satisfaction, and Loyalty Relationship: Applicability of Comparative and Noncomparative Evaluation”. Gadjah Mada International Journal of Business, Vol. 8, no. 3, Sept. 2006, pp. 323-42, https://jurnal.ugm.ac.id/v3/gamaijb/article/view/14894.