Maffry, August, 1905-. Letter to Raymond W. Duning, Box 13, Folder 6, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/archival/1341/item/456879, accessed on August 15, 2018.
Transmitting article by Martin "Foreign Trade Financing Through the Export-Import Bank."
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources