Hasnawati, H., R. Rajindra, and S. Sirajudin. “Analysis of Hajj and Umrah Services at PT. Menara Babussalam Citra Mandiri Palu”. International Journal of Health, Economics, and Social Sciences (IJHESS), Vol. 3, no. 3, July 2021, pp. 202-13, doi:10.56338/ijhess.v3i3.1581.