William F. Hellmuth, Jr. Deputy Assistant Secretary of Treasury for Tax Policy, May 6, 1968, Release Number f-1238
United States. Department of the Treasury. "William F. Hellmuth, Jr. Deputy Assistant Secretary of Treasury for Tax Policy, May 6, 1968, Release Number f-1238," in United States. Department of the Treasury. "Volume 161," Press Releases of the United States Department of the Treasury (March 4, 1968 - June 3, 1968) : 395-397. https://fraser.stlouisfed.org/title/6111/item/587004/toc/541042 , accessed on June 24, 2024.