United States. Department of the Treasury. "Bill Tender, July 12, 1960," in United States. Department of the Treasury. "Volume 122," Press Releases of the United States Department of the Treasury (July 5, 1960 - September 30, 1960) : 52-56. https://fraser.stlouisfed.org/title/6111/item/586965/toc/538247 , accessed on June 24, 2024.