@article{U.S.2012,
author = {U.S., Census Bureau },
title= {Table 1. Educational attainment of the population 18 years and over, by age, sex, race, and Hispanic origin: 2012. Current Population Survey, Annual Social and Economic Supplement},
year = {2012},
URL = {http://www.census.gov/hhes/socdemo/education/data/cps/2012/tables.html},
}