↑"George Crumb". Encyclopedia Britannica. Archived from the original on 4 April 2019. Retrieved 8 September 2019.
↑Richard Steinits, "Crumb, George (Henry)", The New Grove Dictionary of Music and Musicians, secnd edition, edited by Stanley Sadie and John Tyrrell (London: Macmillan Publishers, 2001).
↑Nicolas Slonimsky, Laura Kuhn, and Dennis McIntire, "Crumb, George (Henry Jr.)", Baker's Biographical Dictionary of Musicians, edited by Nicolas Slonimsky and Laura Kuhn (New York, NY: Schirmer, 2001): 2:765–66.
↑Mayfield, Connie (2012). Theory Essentials; An Integrated Approach to Harmony, Ear Training and Keyboard Skills. Cengage Learning. p. 560. ISBN9781133308188.