Ahya Khoirunisa Acwa. Marketing and Service Strategy in an Effort to Improve the Quality of Competition at the Hajj and Umrah Travel Agency at PT. Qiblatain Ama Tour. demagogi [Internet]. 2026 Feb. 18 [cited 2026 Aug. 24];4(1):13-21. Available from: https://demagogi.com/index.php/i/article/view/192