Martin, William McChesney, 1874-1955. Letter to William McChesney Martin, Jr., Box 1, Folder 7, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/content/?item_id=456815&filepath=/files/docs/historical/martin/01_07_19400326.pdf, accessed on May 27, 2018.
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources