R. Maya, M. Sarbini, A. Kohar, and Z. Al-Muktazam, “UMRAH ASSISTANCE MANAGEMENT AS A PILGRIM SERVICE STRATEGY AT PT MARCO TOUR & TRAVEL JAKARTA”, Khidmatul Ummah: Jurnal Pengabdian Kepada Masyarakat, vol. 5, no. 01, pp. 25–38, Jun. 2024.