1. Adhikari, R., Kirkpatrick, C., 1990. Surveys of practice and principles. In: Heath, J.(Ed.), Public Enterprise At The Crossroads. Routledge, London.
2. Aharoni, Y., 1981. Managerial discretion, In: Vernon, R., Aharoni Y. (Eds.), State-Owned Enterprises in the Western Economies. St. Martin’s Press, New York, pp. 184–193.
3. Efficiency in the provision of fire services;Ahlbrandt;Public Choice,1973
4. Implications of contracting for public service;Ahlbrandt;Urban Affairs Quarterly,1974
5. Efficiency differences between private and state-owned enterprises in the international petroleum industry;Al-Obaidan;Applied Economics,1991