United States. Department of the Treasury. "Net Market Transactions, February 16, 1968, Release Number f-1167," in United States. Department of the Treasury. "Volume 160," Press Releases of the United States Department of the Treasury (December 1, 1967 - February 29, 1968) : 768-769. https://fraser.stlouisfed.org/title/6111/item/587003/toc/540971 , accessed on July 9, 2024.