United States. Department of the Treasury. "Readout: Secretary of the Treasury Janet L. Yellen's Call With European Commission Executive Vice President and Commissioner for a Europe Fit for the Digital Age Margrethe Vestager," Press Releases of the United States Department of the Treasury (July 06, 2021). https://fraser.stlouisfed.org/title/6111/item/604446, accessed on March 27, 2025.