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3. Bureau of Labor Statistics. Consumer Expenditure Survey. October 5, 2010. [On-line data file]. Retrieved from http://www.bls.gov/cex/
4. Carliner, M., L. Bowles, and J. Nebbia. The Valuation of Energy Efficiency in Homes. Report prepared for: Washington, DC: U.S. Department of Housing and Urban Development, December 2008.