Kurniawan, Ryan. “RELATIONSHIP OF SERVICE DELIVERY WITH CUSTOMER LOYALTY IN RELIGIOUS TOURISM SERVICES (Study on Umrah Maktour Services in Bandung)”. Central Asia and the Caucasus 23, no. 1 (January 30, 2022): 1309–1319. Accessed November 4, 2026. https://ca-c.org/index.php/cac/article/view/172.