United States. Bureau of Labor Statistics. "April 1991," The Employment Situation (May 3, 1991). https://fraser.stlouisfed.org/title/144/item/56019, accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "April 1991," The Employment Situation (May 3, 1991). https://fraser.stlouisfed.org/title/144/item/56019, accessed on April 18, 2024.