A. Abood, Haidar, and Sabah M. Retha. “Building a Model to Reduce the Cost of Hajj in the Iraqi Authority for Hajj and Umrah”.
Journal of Economics and Administrative Sciences, vol. 26, no. 123, Nov. 2020, pp. 158-75,
https://doi.org/10.33095/jeas.v26i123.1993.