- http://www.davidsuzuki.org/what-you-can-do/reduce-your-carbon-footprint/discourage-urban-sprawl/
- http://usatoday30.usatoday.com/news/sprawl/main.htm
- http://www.buzzle.com/articles/urban-sprawl-causes-and-effects.html
- http://data.worldbank.org/indicator/EN.URB.MCTY
- https://www.google.com/fusiontables/data?dsrcid=implicit
-http://www.ehow.com/info_8136057_solutions-solving-urban-sprawl.html
-http://www.davidsuzuki.org/publications/downloads/2003/driven_gettingstarted.pdf
- http://usatoday30.usatoday.com/news/sprawl/main.htm
- http://www.buzzle.com/articles/urban-sprawl-causes-and-effects.html
- http://data.worldbank.org/indicator/EN.URB.MCTY
- https://www.google.com/fusiontables/data?dsrcid=implicit
-http://www.ehow.com/info_8136057_solutions-solving-urban-sprawl.html
-http://www.davidsuzuki.org/publications/downloads/2003/driven_gettingstarted.pdf