Long, Heather (February 16, 2017). “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.