4Pardey, Roseboom, Craig, Agriculture R&D Investment and impacter. Chapter 3 in J. M. Alston, P. G. Pardey, and V. H. Smith, eds. Paying for Agriculture Productivity. Washington DC: International Food Policy Research Institute. 1977.
5Fuglie et al, "Pubhc- Private Collaboration in Agricultural Research", Iowa State University Press,2000.
6Pray, C. E and R. G. Echeverria, Private- Sector Agricultural Research in Less- Developed Countries. in Agricultural Research Policy, International Quantitative Perspectives, eds. P. G. Pardey, J. Roseboom, and J. roseboom, and J. R. Anderson. Cambridge: Cambridge University Press, 1991.
7Evenson, R. E. and J. Putnam. Intellectual Property Management. in Agricultural Biotechnology : Opportunities for International Development, ed. G.B.Persley. Oxon, Uxon, United Kingdom: C. A. B. intemalional, 1990.
8Bronwyn H. Hall The Financing of Research and Development, NBER Working Paper,2002.
9Dina L. Umali ,Public and Private Sector Roles in Agricultural Research: Theory and Experience,World Bank Discussion Papers, Washington DC,1992.