United States. Department of the Treasury. "Treasury Recommends extension of Interest Equalization Tax, January 17, 1969," in United States. Department of the Treasury. "Volume 163," Press Releases of the United States Department of the Treasury (October 1, 1968 - January 20, 1969) : 823-825. https://fraser.stlouisfed.org/title/6111/item/587006/toc/541295 , accessed on June 23, 2024.