National Compensation Survey: Rockford, IL, June 1998 : Bulletin of the United States Bureau of Labor Statistics, No. 3095-21
United States. Bureau of Labor Statistics. "National Compensation Survey: Rockford, IL, June 1998 : Bulletin of the United States Bureau of Labor Statistics, No. 3095-21," National Compensation Survey (Wages and Salaries) (July 1999). https://fraser.stlouisfed.org/title/6009/item/582311, accessed on April 19, 2024.
United States Bureau of Labor Statistics