Omar, Zakia, and Sami Salih. 2022. “Relationship Marketing and Its Role in Marketing Excellence: An Exploratory Study of the Opinions of a Sample of Managers in Four- and Five-Star Hotels in the City of Duhok”. Humanities Journal of University of Zakho 10 (4):1052-68. https://doi.org/10.26436/hjuoz.2022.10.4.865.