United States. Department of the Treasury. "Preliminary figures on 1 year certificates of indebtedness, May 14, 1959," in United States. Department of the Treasury. "Volume 117," Press Releases of the United States Department of the Treasury (April 2, 1959 - June 30, 1959) : 160-166. https://fraser.stlouisfed.org/title/6111/item/586960/toc/537919 , accessed on June 25, 2024.