"On the American Dead in Spain", New Masses (February 14, 1939)
Ernest Hemingway: Citáty v angličtine (page 23)
Ernest Hemingway bol americký autor a novinár. Citáty v angličtine.Paris Review interview (1958)
As quoted in Charmed Circle: Gertrude Stein & Co. (1974) by James Mellow
Letter to F. Scott Fitzgerald (15 September 1927); published in Ernest Hemingway: Selected Letters 1917–1961 (1981) edited by Carlos Baker
                                        
                                        Pt. 1, Ch. 4 
Papa Hemingway (1966)
                                    
Letter (21 February 1952); published in Ernest Hemingway: Selected Letters 1917–1961 (1981) edited by Carlos Baker
“All good books have one thing in common — they are truer than if they had really happened.”
                                        
                                        Pt. 2, Ch. 7 - Similar to his remark in "A Letter from Cuba" (1934) 
Papa Hemingway (1966)
                                    
Letter to his family (18 October 1918); published in Ernest Hemingway: Selected Letters 1917–1961 (1981) edited by Carlos Baker. It was also published in The Oak Parker (Oak Park, IL) on 16 November 1918. Only 19 years old at the time, Hemingway was recovering from wounds suffered at the front line while serving as a Red Cross volunteer.
                                        
                                        the lowest thing I can think of at this time 
Letter (20 March 1953); published in Ernest Hemingway: Selected Letters 1917–1961 (1981) edited by Carlos Baker
                                    
Notes on the Next War (1935)