United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "July 2016," The Employment Situation (August 5, 2016) : 24-24. https://fraser.stlouisfed.org/title/144/item/533206/toc/518244 , accessed on April 24, 2024.