1. UNCHS (Habitat) (United Nations Center for Human Settlements). Global Urban Indicators Database, Nairobi: United Nations; 1998.
2. Choice of appropriate technologies in the housing sector for conditions prevailing in developing countries;Moavenzadeh,1979
3. UNCHS (Habitat) (United Nations Center for Human Settlements). Basic Facts on Urbanization. Nairobi: United Nations; 1999.
4. De Sensi B. Terracruda, La Diffusione Dell’architettura Di Terra (Soil, Dissemination of Earth Architecture). Available: [accessed: 11.07.08].
5. New materials and techniques for low cost housing projects;Ali,1979