United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "January 2005," The Employment Situation (February 4, 2005) : 16-16. https://fraser.stlouisfed.org/title/144/item/494774/toc/508992 , accessed on April 23, 2024.