[digital vocal score] Porgy and Bess

MLA

Gershwin, George, Ira Gershwin, and Edwin DuBose Heyward. [digital Vocal Score] Porgy and Bess. New York: Gershwin publishing corporation / Chappell & Co, 1935.

APA

Gershwin, G., Gershwin, I., & Heyward, E. DuBose. (1935). [digital vocal score] Porgy and Bess. New York: Gershwin publishing corporation / Chappell & Co.

Chicago

Gershwin, George, Ira Gershwin, and Edwin DuBose Heyward. [digital Vocal Score] Porgy and Bess. New York: Gershwin publishing corporation / Chappell & Co, 1935.