United States. Bureau of Labor Statistics. "National Compensation Survey: Occupational Earnings in the East North Central Census Division, July 2009 : Bulletin of the United States Bureau of Labor Statistics, No. 2739," National Compensation Survey: Occupational Earnings in the United States (June 2010). https://fraser.stlouisfed.org/title/6086/item/584791, accessed on November 14, 2024.