Rofie, Mohamad Khadafi Hj., et al. “MANAGEMENT OF UMRAH PACKAGE OPERATIONS: AN ANALYSIS OF UMRAH OPERATING COMPANIES EXPERIENCE”. CENTRAL ASIA AND THE CAUCASUS, vol. 22, no. 5, July 2024, pp. 60-65, https://ca-c.org/CAC/index.php/cac/article/view/743.