United States. Bureau of Economic Analysis. "Personal Income and Outlays: December 2017 : Historical Comparisons, BEA 18-05," Bureau of Economic Analysis (BEA) News Releases (January 29, 2018). https://fraser.stlouisfed.org/title/6148/item/602612/content/pdf/bea_newsreleases_20180129_historical-comparison, accessed on March 21, 2025.