1. American Cleaning Institute 2010 High efficiency washers and detergents http://www.cleaninginstitute.org/assets/1/Page/HE.pdf
2. Consumer Energy Center 2011 Clothes washers http://www.consumerenergycenter.org/home/appliances/washers.html
3. D&R International, Ltd. 1999 1998 Home appliance buying trends survey prepared for the U.S. Department of Energy http://www.energystar.gov/ia/partners/manuf_res/buyingtrends.pdf
4. Davis , L.W. 2010 Evaluating the slow adoption of energy efficient investments: are renters less likely to have energy-efficient appliances?
5. Ehrhardt-Martinez , K. Laitner , A. 2008 The size of the U.S. energy efficiency market: generating a more complete picture http://aceee.org/research-report/e083