United States. Department of the Treasury. "Treasury's 13-Week Bill Results, February 19, 1991, Release Number nb-1138," in United States. Department of the Treasury. "Volume 305," Press Releases of the United States Department of the Treasury (February 6, 1991 - March 28, 1991) : 75-76. https://fraser.stlouisfed.org/title/6111/item/587148/toc/545587 , accessed on May 18, 2024.