8Marc Holzer, Etienne Charbonneau, Younhee Kim, "Mapping the Terrain of Public Service Quality Improvement : Twenty-Five Years of Trends and Practices in the United States", International Review of Administrative Science,vol. 75, no. 3 (2009),pp. 403-418.
9Ostrom, E., "Multi-mode Measures: From Potholes to Police", Public Productivity Review, no. 3 (1976), pp. 51- 58.
10Ian Sanderson, "Evaluation, Learning and the Effectiveness of Public Services-Towards a quality of public service mod- el", International Journal of Public Sector Management, vol. 9 ,no. 5/6( 1996), pp. 90-108.