United States. Bureau of Labor Statistics. "National Compensation Survey: Washington-Baltimore, DC-MD-VA-WV, February 1997 : Bulletin of the United States Bureau of Labor Statistics, No. 3090-8,"
National Compensation Survey (Wages and Salaries)
(Revised March 1999).
https://fraser.stlouisfed.org/title/6009/item/582248, accessed on December 16, 2025.