United States. Department of the Treasury. "Debt Limitation, May 13, 1963, Release Number d-846," in United States. Department of the Treasury. "Volume 136," Press Releases of the United States Department of the Treasury (April 23, 1963 - May 31, 1963) : 331-332. https://fraser.stlouisfed.org/title/6111/item/586979/toc/539141 , accessed on June 23, 2024.