Clayton, Will, 1880-1966. Letter to William McChesney Martin, Jr., Box 15, Folder 2, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/archival/1341/item/457012, accessed on August 21, 2018.
Regarding China request.
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources