United States. Department of the Treasury. "Bill Tender, July 11, 1939," in United States. Department of the Treasury. "Volume 28," Press Releases of the United States Department of the Treasury (June 20, 1939 - October 11, 1939) : 101-104. https://fraser.stlouisfed.org/title/6111/item/586870/toc/567711 , accessed on April 18, 2024.