Nasution, Azizah Hanim. “Identification Internal and External Factors to Analyze Promising Strategy for Environmental-Friendly Hajj”. JURNAL ILMIAH GEMA PERENCANA 1, no. 3 (April 30, 2023). Accessed January 3, 2026. https://gemaperencana.id/index.php/JIGP/article/view/59.