Pumphrey, Lowell. Personal Letter to "Dear Bill", Box 16, Folder 12, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/scribd/?item_id=457349&filepath=/files/docs/historical/martin/16_12_19481114.pdf&start_page=1, accessed on September 24, 2017.
Handwritten letter on ECA letterhead
- United States. Department of the Treasury
- Export-Import Bank of Washington
- United States. Economic Cooperation Administration
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources