United States. Department of the Treasury. "Treasury Statement re: Governor of Sonora Rodolfo Felix Valdez, May 28, 1986," in United States. Department of the Treasury. "Volume 274," Press Releases of the United States Department of the Treasury (May 12, 1986 - June 30, 1986) : 133-134. https://fraser.stlouisfed.org/title/6111/item/587117/toc/556719 , accessed on June 18, 2024.