The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNS12032197
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Employment Level: Part-Time for Economic Reasons, Nonagricultural Industries [LNS12032197], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNS12032197/, August 30, 2015.