Cita APA (7th ed.)

Gershwin, G. (1971). Porgy und Bess. Komische Oper Berlin.

Cita Chicago (17th ed.)

Gershwin, George. Porgy Und Bess. Berlin: Komische Oper Berlin, 1971.

Cita MLA (8th ed.)

Gershwin, George. Porgy Und Bess. Komische Oper Berlin, 1971.