United States. Department of the Treasury. "Simplified Income Tax Form, June 9, 1948," in United States. Department of the Treasury. "Volume 73," Press Releases of the United States Department of the Treasury (May 29, 1948 - August 9, 1948) : 101-103. https://fraser.stlouisfed.org/title/6111/item/586916/toc/564731 , accessed on May 10, 2024.