APA (7th ed.) Citation

Verdi, G., & Piave, F. M. Rigoletto: Oper in vier Aufzügen. Kulm.

Chicago Style (17th ed.) Citation

Verdi, Giuseppe, and Francesco Maria Piave. Rigoletto: Oper in Vier Aufzügen. [Wien]: Kulm.

MLA (9th ed.) Citation

Verdi, Giuseppe, and Francesco Maria Piave. Rigoletto: Oper in Vier Aufzügen. Kulm.

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