APA (7th ed.) Citation

Bellini, V., & Romani, F. (1929). La sonnambula: Opera in two acts. G. Schirmer.

Chicago Style (17th ed.) Citation

Bellini, Vincenzo, and Felice Romani. La Sonnambula: Opera in Two Acts. New York: G. Schirmer, 1929.

MLA (9th ed.) Citation

Bellini, Vincenzo, and Felice Romani. La Sonnambula: Opera in Two Acts. G. Schirmer, 1929.