(en) David Sheff, All We Are Saying : The Last Major Interview with John Lennon and Yoko Ono, New York, St. Martin's Press, , 1re éd., poche (ISBN978-0-312-25464-3, LCCN00047037)
(en) George Martin et William Pearson, With a Little Help from My Friends : The Making of Sgt. Pepper, Boston, Little Brown, , 1re éd., 176 p. (ISBN978-0-316-54783-3, LCCN95075251)