United States. Bureau of Economic Analysis. "Personal Income and Outlays: June 2018 | Comprehensive Update: 1929 Through May 2018 : Full Release, [BEA 18-39]," Bureau of Economic Analysis (BEA) News Releases (July 31, 2018). https://fraser.stlouisfed.org/title/6148/item/602647/content/pdf/bea_newsreleases_20180731, accessed on March 18, 2025.