Omar, Nor Asiah, Rosidah Musa, and Muhamad Azrin Nazri. 2007. “Program Perceived Value and Program Satisfaction Influences on Store Loyalty: Insights from Retail Loyalty Progam”. Gadjah Mada International Journal of Business 9 (3), 355-78. https://jurnal.ugm.ac.id/v3/gamaijb/article/view/14935.