United States. President and Council of Economic Advisers (U.S.). "International Investment Position of the United States at Year-End," in United States. President and Council of Economic Advisers (U.S.). "1977," Economic Report of the President (1977) : 309-309. https://fraser.stlouisfed.org/title/45/item/8148/toc/329705 , accessed on June 8, 2023.