United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "November 2013," The Employment Situation (December 6, 2013) : 25-25. https://fraser.stlouisfed.org/title/144/item/494880/toc/506257 , accessed on April 25, 2024.