United States. Bureau of Labor Statistics. "National Compensation Survey: Chicago-Gary-Kenosha, IL-IN-WI, October 2001 : Bulletin of the United States Bureau of Labor Statistics, No. 3110-71," National Compensation Survey (Wages and Salaries) (June 2002). https://fraser.stlouisfed.org/title/6009/item/582593, accessed on September 10, 2024.