United States. Bureau of Labor Statistics. "Unemployed Persons by Industry and Class of Worker, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "November 2009," The Employment Situation (December 4, 2009) : 20-20. https://fraser.stlouisfed.org/title/144/item/494832/toc/507686 , accessed on March 28, 2024.