Forrás: The Gershwins' Porgy and Bess. A 75th Anniversary Celebration. George Gershwin. The Gershwins' Porgy and Bess. 1898-1937. and Ira Gershwin.
Fordítás: A Gershwins "Porgy és Bess. A Gershwins "Porgy és Bess. A 75th Anniversary Celebration composed by George Gershwin. és Ira Gershwin.