United States. Department of the Treasury. "Testimony of Secretary of the Treasury Janet L. Yellen to the Subcommittee on State, Foreign Operations, and Related Programs, U.S. House of Representatives,"
Press Releases of the United States Department of the Treasury
(June 10, 2021).
https://fraser.stlouisfed.org/title/6111/item/603937, accessed on September 11, 2024.