@book{National Center2012b,
author = {National Center, for Health Statistics },
title= {Bridged-race intercensal estimates of the resident population of the United States for July 1, 2000-July 1, 2009, by year, county, single-year of age (0, 1, 2, .., 85 years and over), bridged race, hispanic origin, and sex},
year = {2012b},
URL = {http://www.cdc.gov/nchs/nvss/bridged_race.htm},
}