United States. Department of the Treasury. "Bill tender on 159-Day Treasury bills, February 8, 1957," in United States. Department of the Treasury. "Volume 109," Press Releases of the United States Department of the Treasury (January 3, 1957 - April 30, 1957) : 130-132. https://fraser.stlouisfed.org/title/6111/item/586952/toc/537299 , accessed on June 25, 2024.