United States. Bureau of Labor Statistics. "National Compensation Survey: Occupational Wages in the East North Central Census Division, 1999 : Bulletin of the United States Bureau of Labor Statistics, No. 2544-3,"
National Compensation Survey: Occupational Wages in the United States
(July 2001).
https://fraser.stlouisfed.org/title/6084/item/584705, accessed on September 20, 2024.