United States. Bureau of Labor Statistics. "National Compensation Survey: Occupational Wages in the United States, 1999 : Bulletin of the United States Bureau of Labor Statistics, No. 2539,"
National Compensation Survey: Occupational Wages in the United States
(July 2001).
https://fraser.stlouisfed.org/title/6084/item/584702, accessed on November 13, 2024.