United States. Bureau of Labor Statistics. "National Compensation Survey: Grand Rapids-Muskegon-Holland, MI, March 2001 : Bulletin of the United States Bureau of Labor Statistics, No. 3110-22," National Compensation Survey (Wages and Salaries) (December 2001). https://fraser.stlouisfed.org/title/6009/item/584809, accessed on January 28, 2025.