United States. Bureau of Labor Statistics. "National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, December 2003 : Bulletin of the United States Bureau of Labor Statistics, No. 3125-09," National Compensation Survey (Wages and Salaries) (September 2004). https://fraser.stlouisfed.org/title/6009/item/582766, accessed on September 10, 2024.