1. Arkin, H. & Colton, R. 1963. Tables for Statisticians. New York: Barnes & Noble.
2. Baker, C., Lentz R. & Curry, S. 2006. Strategy of Widespread Implementation of Numerous, Independent Small Scale Household Water Treatment Programs. World Water Week in Stockholm. Beyond the River: Sharing Benefits and Responsibilities. August 20–26, Stockholm International Water Institute.
3. Kim, J. & Muller, C. 1978. Introduction to Factor Analysis: W at It Is and How to Do It. Thousand Oaks, CA: Sage.
4. National Planning Commission. 1998. National Planning Commission Report. Kathmandu: NPC.
5. National Planning Commission. 2003. National Planning Commission Report. Kathmandu: NPC.