Martin, William McChesney. Letter to William L. Clayton, Box 14, Folder 3, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/archival/1341/item/457231, accessed on November 16, 2018.
Regarding Douglas H. Allen's observations on Export-Import Bank lending activities
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources