United States. Bureau of Economic Analysis. "Personal Income and Outlays, June 2021 and Annual Update : Historical Comparisons, BEA 21-37," Bureau of Economic Analysis (BEA) News Releases (July 30, 2021). https://fraser.stlouisfed.org/title/6148/item/604947/content/pdf/bea_newsreleases_20210730_historical, accessed on March 24, 2025.