United States. Bureau of Economic Analysis. "U.S. International Investment Position: Second Quarter 2019 : Full Release, BEA 19-49," Bureau of Economic Analysis (BEA) News Releases (September 30, 2019). https://fraser.stlouisfed.org/title/6148/item/602820/content/pdf/bea_newsreleases_20190930, accessed on March 13, 2025.