United States. Department of the Treasury. "Bill offering on 240-Day Treasury bills, July 13, 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) : 429-433. https://fraser.stlouisfed.org/title/6111/item/586969/toc/538518 , accessed on June 24, 2024.