United States. Department of the Treasury. "Proposed tax measures submitted to Congress, August 15, 1967," in United States. Department of the Treasury. "Volume 158," Press Releases of the United States Department of the Treasury (June 1, 1967 - August 29, 1967) : 508-546. https://fraser.stlouisfed.org/title/6111/item/587001/toc/540787 , accessed on May 19, 2024.