U.S. and Bulgaria To Negotiate A New Income Tax Treaty, May 8, 1990, Release Number nb-797
United States. Department of the Treasury. "U.S. and Bulgaria To Negotiate A New Income Tax Treaty, May 8, 1990, Release Number nb-797," in United States. Department of the Treasury. "Volume 297," Press Releases of the United States Department of the Treasury (April 3, 1990 - May 8, 1990) : 520-521. https://fraser.stlouisfed.org/title/6111/item/587140/toc/545121 , accessed on May 18, 2024.