Long, Heather (2017年2月16日). “U.S. auto workers hate NAFTA ... but love robots”. CNNMoney. 2017年2月21日閲覧。 “"The problem, they argue, is that machines took over. One study by Ball State University says 87% of American manufacturing jobs have been lost to robots. Only 13% have disappeared because of trade...But workers in Michigan think the experts have it wrong."”
Romalis, John (2007-07-12). “NAFTA's and CUSFTA's Impact on International Trade”. Review of Economics and Statistics89 (3): 416-35. doi:10.1162/rest.89.3.416. ISSN0034-6535.
Romalis, John (2007-07-12). “NAFTA's and CUSFTA's Impact on International Trade”. Review of Economics and Statistics89 (3): 416-35. doi:10.1162/rest.89.3.416. ISSN0034-6535.