APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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