United States. Bureau of Labor Statistics. "Occupational Compensation Survey: Part I: Pay in the United States and Regions, June 1992 : Bulletin of the United States Bureau of Labor Statistics, No. 2439-1," Occupational Compensation Survey: National Summary (December 1993). https://fraser.stlouisfed.org/title/6077/item/584588, accessed on October 15, 2024.