6Axinn G H. Guide on alternative extension approaches [ M ]. Food and Agricuhure Organization of the United Nations, Rome. 1988.
7Axinn N W, Axinn G H. The Huamn Dynamic of Natural Resource Systems [ A ]. In: Shivakoti G. et al. People and participation in Sustainable Development-Understanding the Dynamics of natural Resource Systems[ C ]. Proceedings of an International Conference-Workshop in Political Theory and Policy Analysis. Nepal, 1997.
8Jenssen B. Planning as a Dialogue[M]. Germany: Press of University of Dortmund, 1998.
9Weber K E, Tiwari I P. Research and Survey Format Design: An Introduction[M]. Bangkok: Press of Asian Institute of Technology, 1992:109.