The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNS12327662
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Employment-Population Ratio: Bachelor's Degree and Higher, 25 years and over [LNS12327662], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNS12327662/, July 29, 2015.