Hassett, William D., 1880-1965. Letter to Mr. Martin, Box 13, Folder 7, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/scribd/?item_id=457229&filepath=/files/docs/historical/martin/13_07_19470128.pdf&start_page=1, accessed on October 16, 2017.
Secretary to the President. Regarding Martin's letter to the President about political pressures on the Export-Import Bank
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources