Sopyan, Dedi, M. Syamsul Maarif, Joko Affandi, and Laily Dwi Arsyianti. 2023. “Nurturing The Ecosystem of Hajj and Umrah Business in Indonesia: A Model For Development”. Indonesian Journal of Business and Entrepreneurship 9 (3): 359. https://doi.org/10.17358/ijbe.9.3.359.