United States. Bureau of Labor Statistics. "National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, December 2005 : Bulletin of the United States Bureau of Labor Statistics, No. 3135-11," National Compensation Survey (Wages and Salaries) (October 2006). https://fraser.stlouisfed.org/title/6009/item/582923, accessed on September 15, 2024.