Marwati, D., and D. P. Sari. “The Influence of Service Quality on Customer Satisfaction at Kopi Sadis Medan Cafe”. Jurnal Ekonomi, vol. 13, no. 01, Mar. 2024, pp. 1936-43, https://ejournal.seaninstitute.or.id/index.php/Ekonomi/article/view/4130.