1.
Tahir M. Building an Effective Supervision System for PPIU: Policy for Enhancing Trust and Quality of Umrah Services. j.ilm.gema.perenc. [Internet]. 2025 Apr. 10 [cited 2025 May 16];3(3):535-52. Available from: https://gemaperencana.id/index.php/JIGP/article/view/188