Taufik, Edi Rahmat. “THE BUILD OF CUSTOMER LOYALTY BY POLICY OF PRICE ON SALES PROMOTION”. Management Science Research Journal 1, no. 2 (May 6, 2022): 65–71. Accessed August 2, 2026. https://smanagementscienceresearchjournal.com.msjr.my.id/index.php/msr/article/view/50.