For further information regarding Quarterly Services, visit the source website at http://www.census.gov/services/
Source: US. Bureau of the Census
Release: Quarterly Services Survey
US. Bureau of the Census, Revenues from Business for Legal Services, Establishments Subject to Federal Income Tax [BUS5411TAXABL157QNSA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/BUS5411TAXABL157QNSA/, August 31, 2015.