United States. Bureau of Labor Statistics. "Persons Not in Labor Force by Reason, Sex, and Race, Quarterly Averages," in United States. Bureau of Labor Statistics. "June 1987," The Employment Situation (July 2, 1987) : 16-16. https://fraser.stlouisfed.org/title/144/item/56016/toc/492053 , accessed on May 4, 2024.