Underwood, Angela; News, Stacker (17. januar 2021). «These Are the 50 Most Covered Songs of All Time». Newsweek (på engelsk). Besøkt 20. mars 2024. «"Summertime" was adapted by soprano Helen Jepson from the 1935 George Gershwin opera Porgy and Bess. The song gained momentum as a cover when Ella Fitzgerald and Louis Armstrong recorded it for a jazz album in 1957....»
