Tirtayasa, Satria. “Effect Of Product Quality And Service On Customer Loyalty With Customer Satisfaction As An Intervening Variable (Study On Coffee Shop In Medan)”. International Journal of Science, Technology & Management 3, no. 5 (September 24, 2022): 1438-1444. Accessed January 30, 2025. https://ijstm.inarah.co.id/index.php/ijstm/article/view/633.