|唱片公司||Parlophone / EMI (英國)
Capitol Records (美國)
- At one time, Guinness World Records cited "Yesterday" with the most cover versions of any song ever written – 2,200. However, "Summertime", an aria composed by George Gershwin for the 1935 opera Porgy and Bess has been claimed to have well over 30,000 recorded performances, far more than the 1,600 claimed for "Yesterday".
- Guinness World Records 2009.
- The Summertime Connection. [31 August 2011].
- Cross, Craig. BEATLES SONGS - Y. 2004 [2004-12-09]. (broken link as of 2007-03-09)