United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "October 2013," The Employment Situation (November 8, 2013) : 25-25. https://fraser.stlouisfed.org/title/144/item/494879/toc/506287 , accessed on April 25, 2024.