United States. Department of the Treasury. "New U.S.-Belgium income tax convention signed, July 16, 1970," in United States. Department of the Treasury. "Volume 169," Press Releases of the United States Department of the Treasury (May 6, 1970 - August 3, 1970) : 571-573. https://fraser.stlouisfed.org/title/6111/item/587012/toc/541847 , accessed on June 16, 2024.