APA (7th ed.) Citation

Gershwin, G., Heyward, D., & Heyward, D. (1935). Porgy and Bess / music by G. Gershwin, libretto by D. Heyward. Chappell.

Chicago Style (17th ed.) Citation

Gershwin, George, DuBose Heyward, and Dorothy Heyward. Porgy and Bess / Music by G. Gershwin, Libretto by D. Heyward. Chappell, 1935.

MLA (9th ed.) Citation

Gershwin, George, et al. Porgy and Bess / Music by G. Gershwin, Libretto by D. Heyward. Chappell, 1935.

Warning: These citations may not always be 100% accurate.