APA (7th ed.) Citation

Verdi, G., Mery, J., & Du Locle, C. (1958). Don Carlo: Opera in four acts. G. Schirmer.

Chicago Style (17th ed.) Citation

Verdi, Giuseppe, Joseph Mery, and Camille Du Locle. Don Carlo: Opera in Four Acts. New York: G. Schirmer, 1958.

MLA (9th ed.) Citation

Verdi, Giuseppe, et al. Don Carlo: Opera in Four Acts. G. Schirmer, 1958.