United States. Department of the Treasury. "Bill tender on 365-Day T. Bills, April 13, 1961," in United States. Department of the Treasury. "Volume 124," Press Releases of the United States Department of the Treasury (January 24, 1961 - April 27, 1961) : 461-464. https://fraser.stlouisfed.org/title/6111/item/586967/toc/538440 , accessed on June 23, 2024.