^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.
^Richard Steinits, "Crumb, George (Henry)", The New Grove Dictionary of Music and Musicians, secnd edition, edited by ستانلي سادي and جون تيريل (London: Macmillan Publishers, 2001).
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