1. Growth, innovation, scaling, and the pace of life in cities;LMA Bettencourt;Proceedings of the National Academy of Sciences,2007
2. Jacobs J (1961) The Death and Life of Great American Cities. New York: Vintage Books, 458 p.
3. Sachs JD, Layard R, Helliwell JF (2012) World Happiness Report. Technical report, Columbia University/Canadian Institute for Advanced Research/London School of Economics.
4. Gallup-Healthways (2012) State of well-being 2011: City, state and congressional district wellbeing reports. Technical report, Gallup Inc. Available: http://www.well-beingindex.com/files/2011CompositeReport.pdf.
5. Gallup-HealthwaysWell-Being Index. Available: http://www.well-beingindex.com/. Accessed February 2013.