The Papers of John F. Kennedy, Presidential Papers, National Security Files, Meetings and Memoranda Series, National Security Action Memoranda, National Security Action Memorandum Number 47. John F. Kennedy Presidential Library and Museum, Boston, Massachusetts
The Papers of John F. Kennedy, Presidential Papers, National Security Files, Meetings and Memoranda Series, National Security Action Memoranda, National Security Action Memorandum Number 47: Soviet Assistance to Cuba, April 25, 1961