Johnson, Richard N. Letter to George W. Burgess, Box 13, Folder 4, William McChesney Martin, Jr., Papers. https://fraser.stlouisfed.org/scribd/?item_id=456893&filepath=/files/docs/historical/martin/13_04_19460206d.pdf&start_page=1, accessed on September 21, 2017.
Regarding anticipated capital expenditures for foreign commercial air transportation
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources