United States. Department of the Treasury. "Bill Tender, January 15, 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) : 43-47. https://fraser.stlouisfed.org/title/6111/item/586952/toc/537277 , accessed on June 25, 2024.