Lewisohn 2005, p. 60. Lewisohn, Mark[英語版] (2005年) [1988]. The Complete Beatles Recording Sessions: The Official Story of the Abbey Road Years 1962-1970. London: Bounty Books. ISBN978-0-7537-2545-0.
Everett 2001, pp. 303–304, 310. Everett, Walter[英語版] (2001年). The Beatles as Musicians: The Quarry Men Through Rubber Soul. New York, NY: Oxford University Press. ISBN0-19-514105-9.
Everett 2001, pp. 303–304. Everett, Walter[英語版] (2001年). The Beatles as Musicians: The Quarry Men Through Rubber Soul. New York, NY: Oxford University Press. ISBN0-19-514105-9.
Everett 2001, pp. 303, 346. Everett, Walter[英語版] (2001年). The Beatles as Musicians: The Quarry Men Through Rubber Soul. New York, NY: Oxford University Press. ISBN0-19-514105-9.