F. Scott Fitzgerald (2015). “Collected Letters of F. Scott Fitzgerald: From the author of The Great Gatsby, The Side of Paradise, Tender Is the Night, The Beautiful and Damned, The Love of the Last Tycoon, The Curious Case of Benjamin Button and many other notable works”, p.161, e-artnow
Edgard Varèse lecture, edited by Chou Wen-Chung, published in: "391", Nr. 5. June 17, 1917, translated by Louise Varèse; Quoted in: "Classic Essays on Twentieth-Century Music: A Continuing Symposium", 1996.