United States. Department of the Treasury. "Bill Offering, April 28, 1960," in United States. Department of the Treasury. "Volume 121," Press Releases of the United States Department of the Treasury (April 1, 1960 - June 30, 1960) : 168-171. https://fraser.stlouisfed.org/title/6111/item/586964/toc/538194 , accessed on June 24, 2024.