1. Ayub, M. and Hegstag, S. O.(1986) “Public Industrial Enterprises: Determinants of Performance”. Washington D. C.: World Bank Industry and Finance Series.
2. Balassa, B.(1971) The Structure of Protection in Developing Countries. Baltimore : John Hopkins University Press.
3. Furubotn, Eirik G. and Pejovich, Svetozar. (1972) “Property Rights and Economic Theory: A Survey of Recent Literature” Journal of Economic Literature, pp. 1137 - 62.
4. Hwa, E. C.(1986) “The Contribution of Agriculture to Economic Growth: Some Empirical Evidence”. The World Bank Staff Working Papers, No. 619
5. Krueger, A. O.(1975) Foreign Trade Regimes and Economic Development: Liberalization Attempts and Consequences. Cambridge Mass: Ballinger.