Bibliography 
http://www.sice.oas.org/trade/nafta/chap-01.asp
http://www.kwintessential.co.uk/articles/canada/canadian-benefits-of-nafta/2775
http://www.fas.usda.gov/info/factsheets/NAFTA.asp
http://useconomy.about.com/od/tradepolicy/p/NAFTA_Advantage.htm
http://www.tecma.com/nafta/