United States. Bureau of Economic Analysis. "First Quarter 1969 : Corporate Profits, Revised GNP, Federal Receipts and Expenditures, OBE 69-23,"
Bureau of Economic Analysis (BEA) News Releases
(May 16, 1969).
https://fraser.stlouisfed.org/title/6148/item/594986, accessed on March 22, 2025.