Sopyan, Dedi, M. Syamsul Maarif, Joko Affandi, and Laily Dwi Arsyianti. “Nurturing The Ecosystem of Hajj and Umrah Business in Indonesia: A Model For Development”. Indonesian Journal of Business and Entrepreneurship 9, no. 3 (September 13, 2023): 359. Accessed December 28, 2025. https://journal.ipb.ac.id/ijbe/article/view/46427.