United States. Department of the Treasury. "Treasury Publishes 2nd Annual Report on High Income Tax Returns," in United States. Department of the Treasury. "Volume 216," Press Releases of the United States Department of the Treasury (August 1, 1978 - September 15, 1978) : 238-241. https://fraser.stlouisfed.org/title/6111/item/587059/toc/530210 , accessed on June 8, 2023.