United States. Department of the Treasury. "Bill Tender, August 1, 1961," in United States. Department of the Treasury. "Volume 126," Press Releases of the United States Department of the Treasury (June 2, 1961 - July 31, 1961) : 597-600. https://fraser.stlouisfed.org/title/6111/item/586969/toc/538536 , accessed on June 24, 2024.