United States. Department of the Treasury. "Mint Announces Return Of Copper Penny," in United States. Department of the Treasury. "Volume 49," Press Releases of the United States Department of the Treasury (October 11, 1943 - November 19, 1943) : 222-238. https://fraser.stlouisfed.org/title/6111/item/586892/toc/561779 , accessed on July 10, 2024.