1. Joint Canada/United States Survey of Health 2002-03;Sanmartin,2004
2. http://www.census.gov/population/www/estimates/aboutmetro.html. Accessed September 11, 2006.
3. http://factfinder.census.gov/servlet/DTGeoSearchByListServlet?ds_name=DEC_2000_SF1_U&_lang=en&_ts=168713956890. Accessed September 11, 2006.
4. http://www.aapos.org/associations/5371/files/apposdb3.html. Accessed September 11, 2006.
5. Mappoint,2004