United States. Department of the Treasury. "Bill results, December 6, 1971," in United States. Department of the Treasury. "Volume 176," Press Releases of the United States Department of the Treasury (November 1, 1971 - December 28, 1971) : 414-415. https://fraser.stlouisfed.org/title/6111/item/587019/toc/571780 , accessed on April 19, 2024.