United States. Department of the Treasury. "Treasury Press Statement on Tax Reform, August 13, 1921," 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) : 369-371. https://fraser.stlouisfed.org/title/6111/item/586836/toc/558044 , accessed on September 22, 2023.