Mhalhal , K. A. . ., and muqdad A. . Nouri. “The Role of Environmental Costs in Achieving Competitive Advantage in Economic Units”. Baghdad College of Economic Sciences University Journal (BCESUJ), vol. 72, no. 4, Apr. 2023, pp. 199-18, https://bcuj.baghdadcollege.edu.iq/index.php/BCESUJ/article/view/294.