5. Bureau of Labor Statistics Local Area Unemployment Statistics, 1976-1989 Bookmark Format Macrodata source
8. Concordances between the 1980 and 1991 editions of the Standard Occupational Classification (SOC) Bookmark Format Macrodata source
9. Concordances between the 1980 Standard Occupational Classification (SOC) and the National Occupational Classification (NOC) Bookmark Format Macrodata source
10. Consistent dataset for the net income distribution for 190 countries, aggregated to 32 geographical regions and the world from 1958–2015 Bookmark Format Macrodata source