ג'ורג' מרטין – הבדלי גרסאות

* Lewisohn, Mark (1990). The Beatles: Recording Sessions. Three Rivers Press; Reprint edition. {{ISBN |978-0517581827}}.

* MacDonald, Ian (1994). Revolution in the Head: The Beatles' Records and the Sixties. New York: Henry Holt and Company. {{ISBN |0-8050-2780-7}}.

* Martin, George; Hornsby, Jeremy (1994). All You Need Is Ears. New York: St. Martin's Press. {{ISBN |0-312-11482-6}}.

* Martin, George; Pearson, William (1994). With a Little Help from My Friends: The Making of Sgt. Pepper. Boston: Little, Brown. {{ISBN |0-316-54783-2}}.

* Miles, Barry (1997). Many Years from Now. Vintage-Random House. {{ISBN |0-7493-8658-4}}.

* Spitz, Bob (2005). The Beatles: The Biography. Little, Brown and Company (New York). {{ISBN |1-84513-160-6}}.