Income tax treaty between the U.S. and Portugal to be discussed, August 26, 1964, Release Number d-1325
United States. Department of the Treasury. "Income tax treaty between the U.S. and Portugal to be discussed, August 26, 1964, Release Number d-1325," in United States. Department of the Treasury. "Volume 144," Press Releases of the United States Department of the Treasury (August 4, 1964 - September 30, 1964) : 140-144. https://fraser.stlouisfed.org/title/6111/item/586987/toc/539491 , accessed on June 24, 2024.