Aiken, George D. (George David), 1892-1984. Letter to Mr. William McC. Martin, Jr., Box 11, Folder 6, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/archival/1341/item/457289, accessed on August 20, 2018.
Letter from Chairman of the Senate Committee on Expenditures in the Executive Departments regarding interest paid to the Treasury Department
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources