United States. President (1945-1953 : Truman), Harry S. Truman (1962). “Harry S. Truman: Containing the Public Messages, Speeches, and Statements of the President, 1945-53”
Tom Stoppard (2012). “Tom Stoppard Plays 2: The Dissolution of Dominic Boot; 'M' is for Moon Among Other Things; If You're Glad I'll Be Frank; Albert's Bridge; Where Are They Now?; Artist Descending a Staircase; The Dog It Was That Died; In the Native State; On 'Dover Beach'”, p.103, Faber & Faber
"Comparing “Heaven is for Real” with “God’s Not Dead” + an interview with “Heaven” writer/director Randall Wallace". Interview with John W. Kennedy, www.beliefnet.com.