United States. Bureau of Labor Statistics. "National Compensation Survey: Richland-Kennewick-Pasco, WA, January 1999 : Bulletin of the United States Bureau of Labor Statistics, No. 3095-46,"
National Compensation Survey (Wages and Salaries)
(August 1999).
https://fraser.stlouisfed.org/title/6009/item/582336, accessed on December 16, 2025.