United States. Bureau of Labor Statistics. "February 1981," The Employment Situation (March 6, 1981). https://fraser.stlouisfed.org/title/144/item/56142, accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "February 1981," The Employment Situation (March 6, 1981). https://fraser.stlouisfed.org/title/144/item/56142, accessed on April 25, 2024.