United States. Bureau of Economic Analysis. "U.S. International Investment Position: Fourth Quarter and Year 2019 : Highlights, Annual: U.S. International Investment Position, Year 2019, BEA 20-15," Bureau of Economic Analysis (BEA) News Releases (March 31, 2020). https://fraser.stlouisfed.org/title/6148/item/602890/content/pdf/bea_newsreleases_20200331_release-highlights--annual, accessed on March 17, 2025.