United States. Bureau of Labor Statistics. "National Compensation Survey: Occupational Wages in the United States, 1998 : Bulletin of the United States Bureau of Labor Statistics, No. 2529,"
National Compensation Survey: Occupational Wages in the United States
(September 2000).
https://fraser.stlouisfed.org/title/6084/item/584701, accessed on September 14, 2024.