United States. Bureau of Economic Analysis. "Personal Income and Outlays: March 2018 : Full Release, BEA 18-20," Bureau of Economic Analysis (BEA) News Releases (April 30, 2018). https://fraser.stlouisfed.org/title/6148/item/602627/content/pdf/bea_newsreleases_20180430, accessed on March 15, 2025.