The series comes from the 'Current Employment Statistics (Establishment Survey)'
The source code is: CEU6056132001
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Professional and Business Services: Temporary Help Services [TEMPHELPN], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/TEMPHELPN/, August 2, 2015.