United States. Department of the Treasury. "Substantial capital required for U.S. Energy industries, May 9, 1973," in United States. Department of the Treasury. "Volume 184," Press Releases of the United States Department of the Treasury (April 27, 1973 - June 29, 1973) : 189-192. https://fraser.stlouisfed.org/title/6111/item/587027/toc/543214 , accessed on June 25, 2024.