United States. Bureau of Labor Statistics. "National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, December 2001 : Bulletin of the United States Bureau of Labor Statistics, No. 3115-08," National Compensation Survey (Wages and Salaries) (August 2002). https://fraser.stlouisfed.org/title/6009/item/582609, accessed on September 19, 2024.