United States. Department of the Treasury. "Second Volume of "Statistics of Income - 1936", January 13, 1941," in United States. Department of the Treasury. "Volume 33," Press Releases of the United States Department of the Treasury (December 26, 1940 - March 13, 1941) : 64-72. https://fraser.stlouisfed.org/title/6111/item/586875/toc/560586 , accessed on June 25, 2024.