1. Palestinian Central Bureau of Statistics. Average consumer prices in Palestine, 1996.
2. Mohammad A. Thermal resistance of building materials. B.S. graduation project, Birzeit University 1995.
3. Al-Eish S. Guide for building insulation materials. Royal Scientific Society of Jordan, Amman 1990.
4. ASHRAE, Hand Book of Applications 1995.
5. Engineering economics;Riggs,1982