United States. Department of the Treasury. "Debt Limitation, February 12, 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) : 136-139. https://fraser.stlouisfed.org/title/6111/item/586952/toc/537302 , accessed on June 25, 2024.