United States. Bureau of Economic Analysis. "Personal Income and Outlays: December 2011 : Highlights: Personal Income Rises in December, BEA 12-03,"
Bureau of Economic Analysis (BEA) News Releases
(January 30, 2012).
https://fraser.stlouisfed.org/title/6148/item/601317/content/pdf/bea_newsreleases_20120130_release-highlights, accessed on July 11, 2025.