National Compensation Survey: Pittsburgh, PA, July 1999 : Bulletin of the United States Bureau of Labor Statistics, No. 3100-11
United States. Bureau of Labor Statistics. "National Compensation Survey: Pittsburgh, PA, July 1999 : Bulletin of the United States Bureau of Labor Statistics, No. 3100-11," National Compensation Survey (Wages and Salaries) (May 2000). https://fraser.stlouisfed.org/title/6009/item/582386, accessed on March 28, 2024.
United States Bureau of Labor Statistics