The Papers of John F. Kennedy, Presidential Papers, National Security Files, Meetings and Memoranda Series, National Security Action Memoranda, National Security Action Memorandum Number 23. John F. Kennedy Presidential Library and Museum, Boston, Massachusetts
National Security Action Memorandum Number 23: Questions Arising form Senator Smathers' Recommendation that Remaining Exports from Cuba to the US be Embargoed, February 21, 1961