National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, February 1998 : Bulletin of the United States Bureau of Labor Statistics, No. 3090-49
United States. Bureau of Labor Statistics. "National Compensation Survey: Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD, February 1998 : Bulletin of the United States Bureau of Labor Statistics, No. 3090-49," National Compensation Survey (Wages and Salaries) (August 1998). https://fraser.stlouisfed.org/title/6009/item/582289, accessed on April 19, 2024.
United States Bureau of Labor Statistics