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 July 31, 2026.