United States. Department of the Treasury. "Bill Offering, June 21, 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) : 246-254. https://fraser.stlouisfed.org/title/6111/item/586969/toc/538501 , accessed on June 24, 2024.