Source: U.S. Bureau of Labor Statistics
Release: Employment Situation
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNS14200000
U.S. Bureau of Labor Statistics, Unemployment Rate: Part-Time Workers [LNS14200000], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNS14200000, April 20, 2018.