[47: See Krueger and Katz (2016), "The Rise and Nature of Alternative Work Arrangements in the United States, 1995-2015".
[47: Vidjeti Krueger i Katz (2016.), „The Rise and Nature of Alternative Work Arrangements in the United States, 1995-2015" („Razvoj i priroda alternativnih oblika rada u Sjedinjenim Američkim Državama, 1995.-2015.").