United States. Bureau of Labor Statistics. "Occupational Status of the Employed and Unemployed, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "March 1988," The Employment Situation (April 1, 1988) : 14-14. https://fraser.stlouisfed.org/title/144/item/56199/toc/493131 , accessed on April 24, 2024.