United States. Bureau of Economic Analysis. "Personal Income and Outlays, September 2021 : Historical Comparisons, BEA 21-53," Bureau of Economic Analysis (BEA) News Releases (October 29, 2021). https://fraser.stlouisfed.org/title/6148/item/609982/content/pdf/bea_newsreleases_20211029_historical, accessed on March 21, 2025.