MacDonald, Ian (2005). Revolution in the Head: The Beatles' Records and the Sixties . London: Pimlico (Rand). ISBN1-84413-828-3. Bảo trì CS1: Văn bản dư (link)
Matovina, Dan (2000). Without You: The Tragic Story of Badfinger. Frances Glover Books. ISBN0-9657122-2-2. Apple's Neil Aspinall remembers, "(...) Badfinger just popped in my head. It was from an old Lennon thing. He was playing the piano and he had a bad finger so he called the piece he was playing 'Bad Finger Boogie' (which evolved into 'With A Little Help From My Friends')
