Hashar, S. ., and M. Shaiq. “Role of Airports’ Tangible and Intangible Features As Alternate Sources for Retail Revenue Generation – A Study of Karachi Airport in Pakistan”. Research Journal for Societal Issues, vol. 6, no. 1, Mar. 2024, pp. 170-86, doi:10.56976/rjsi.v6i1.173.