United States. Bureau of Economic Analysis. "U.S. International Investment Position, Fourth Quarter and Year 2021 : Special Purpose Entities In the International Investment Position Accounts, BEA 22-12," Bureau of Economic Analysis (BEA) News Releases (March 29, 2022). https://fraser.stlouisfed.org/title/6148/item/611769/content/pdf/bea_newsreleases_20220329_specialpurposeentities-in-iip, accessed on March 23, 2025.