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2. Fraser, R. P., Steve (1995). You Build: A Guide to Building Your Own Home. London, The Walter Segal Self Build Trust.
3. Gough, K. V. (1996). Self-help Housing in Urban Colombia; Alternatives for the Production on Distribution of Building Materials., Habitat International 20(4): 635-651.
4. Harris, P. B. C. (2001). Out of the Woods. Northumberland, The Centre of Alternative Technology Publications & The Walter Segal Self Build Trust.
5. Hilgeman, J. (2004). A Prefabricated Framing and Enclosure System: Economy, Flexibility and Applications. Department of Architecture. Washington, University of Washington.