United States. Department of the Treasury. "Income tax convention discussions with Ghana, October 12, 1959," in United States. Department of the Treasury. "Volume 119," Press Releases of the United States Department of the Treasury (October 1, 1959 - December 30, 1959) : 67-75. https://fraser.stlouisfed.org/title/6111/item/586962/toc/538029 , accessed on June 25, 2024.