The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNS12032200
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Employment Level: Part-Time for Noneconomic Reasons, Nonagricultural Industries [LNS12032200], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNS12032200/, July 3, 2015.