United States. Bureau of Labor Statistics. "National Compensation Survey: Chicago-Gary-Kenosha, IL-IN-WI, September 2000 : Bulletin of the United States Bureau of Labor Statistics, No. 3105-79," National Compensation Survey (Wages and Salaries) (June 2001). https://fraser.stlouisfed.org/title/6009/item/582533, accessed on January 15, 2025.