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R. Iraz and  K. Eryeşil,  Effect of Leadership Approach to Organizational Commitment: A Study in Transportation Sector.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 2143 - 2149[viewed 23 October 2017]. Available from: http://waset.org/publications/4194.