FRB Official Correspondence : 1951-1968, Box 21, Folder 1, William McChesney Martin, Jr., Papers. Missouri History Museum. https://fraser.stlouisfed.org/content/?item_id=472999&filepath=/files/docs/historical/martin/martin_s05_a_21_01.pdf, accessed on July 22, 2018.
Original copy is missing pages: Letter from Alan Sproul at page 50 of pdf, Letter to Allan Kline at page 80 of pdf, and page 1 of Memorandum for the President at page 84 of pdf.
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources