Gershwin, G., Gershwin, I., & Heyward, D. (1935). Porgy and Bess: Vocal selection. Gershwin.
Chicago Style (17th ed.) CitationGershwin, George, Ira Gershwin, and DuBose Heyward. Porgy and Bess: Vocal Selection. New York: Gershwin, 1935.
MLA (8th ed.) CitationGershwin, George, et al. Porgy and Bess: Vocal Selection. Gershwin, 1935.
Warning: These citations may not always be 100% accurate.