United States. Department of the Treasury. "Revenue Bill of 1926 Tax on Specified Income Under 1924 Act," in United States. Department of the Treasury. "Volume 3A," Press Releases of the United States Department of the Treasury (January 5, 1924 - December 7, 1925) : 411-411. https://fraser.stlouisfed.org/title/6111/item/586840/toc/558596 , accessed on May 20, 2024.