United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "June 2016," The Employment Situation (July 8, 2016) : 24-24. https://fraser.stlouisfed.org/title/144/item/531158/toc/518124 , accessed on May 1, 2024.