Clayton, Will, 1880-1966. Letter to William McChesney Martin, Jr., Box 15, Folder 2, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/scribd/?item_id=457012&filepath=/files/docs/historical/martin/15_02_19461029.pdf, accessed on December 13, 2017.
Regarding China request.
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources