United States. Bureau of Labor Statistics. "National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, December 2000 : Bulletin of the United States Bureau of Labor Statistics, No. 3110-07," National Compensation Survey (Wages and Salaries) (September 2001). https://fraser.stlouisfed.org/title/6009/item/582541, accessed on September 7, 2024.