United States. Department of the Treasury. "Savings Bond Sales, May 13, 1948," in United States. Department of the Treasury. "Volume 72," Press Releases of the United States Department of the Treasury (April 2, 1948 - May 27, 1948) : 359-361. https://fraser.stlouisfed.org/title/6111/item/586915/toc/569864 , accessed on June 10, 2023.