United States. Department of the Treasury. "Market Transactions, February 15, 1960," in United States. Department of the Treasury. "Volume 120," Press Releases of the United States Department of the Treasury (January 5, 1960 - March 31, 1960) : 216-220. https://fraser.stlouisfed.org/title/6111/item/586963/toc/538136 , accessed on June 24, 2024.