United States. Bureau of Labor Statistics. "Unemployed Persons by Reason for Unemployment, Sex, Age, and Color," in United States. Bureau of Labor Statistics. "March 1972," The Employment Situation (April 7, 1972) : 10-10. https://fraser.stlouisfed.org/title/144/item/496982/toc/513101 , accessed on April 19, 2024.