1. Alex, G., Zijp, W., Byerlee D., with input from the AKIS Thematic Team (2002). “Rural extension and advisory services: New directions”, Rural Development Strategy Background Paper #9, ARD. World Bank, Washington, DC
2. Science Under Scarcity: Principles and Practice for Agricultural Research Evaluation and Priority Setting;Alston,1995
3. Alston, J.M., Chan-Kang, C., Marra, M.C., Pardey, P.G., Wyatt, T.J. (2000). “A meta-analysis of rates of return to agricultural R&D: Ex Pede Herculem?”, Research Report 113. IFPRI, Washington, DC
4. Ameur C. (1994). “Agricultural extension: A step beyond the next step”, World Bank Technical Paper 247. World Bank, Washington, DC
5. Institutional reforms for getting an agricultural knowledge system to play its role in economic growth;Anderson;Pakistan Development Review,1999