Summary of Recommendations Upon Taxation Made by Secretary Houston before the Senate Committee on Finance, December 27, 1920
United States. Department of the Treasury. "Summary of Recommendations Upon Taxation Made by Secretary Houston before the Senate Committee on Finance, December 27, 1920," in United States. Department of the Treasury. "Volume 1A," Press Releases of the United States Department of the Treasury (March 30, 1918 - December 26, 1921) : 301-303. https://fraser.stlouisfed.org/title/6111/item/586836/toc/558026 , accessed on September 22, 2023.