Nurjaman, Kadar, Encup Supriatna, and Rojudin. “Quality Assurance Model of Hajj and Umrah Guidance Groups (KBIHU) Based on Islamic Boarding Schools in Serving Prospective Pilgrims: A Case Study of KBIHU Organized by Islamic Boarding Schools in West Java Province”. TEC EMPRESARIAL 20, no. 1 (March 5, 2025): 102–116. Accessed July 3, 2026. http://revistas.tec-ac.cr/index.php/tec_empresarial/article/view/540.