Stuart Eizenstat and Robert Lerman, “Apprenticeships Could Help U. S. Workers Gain a Competitive Edge” (Washington, D.C., Urban Institute, May 2013); Mark P. Mills, “Are Skilled Trades Doomed to Decline?” Manhattan Institute, New York, 2016, http://www.manhattan-institute.org/sites/default/files/IB-MM-1016.pdf.
