United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "October 2010," The Employment Situation (November 5, 2010) : 25-25. https://fraser.stlouisfed.org/title/144/item/494843/toc/507367 , accessed on April 27, 2024.