APA (7th ed.) Citation

Bizet, G., Meilhac, H., & Halévy, L. (1900). Carmen: Oper in vier Akten. Ahn.

Chicago Style (17th ed.) Citation

Bizet, Georges, Henri Meilhac, and Ludovic Halévy. Carmen: Oper in Vier Akten. Köln: Ahn, 1900.

MLA (9th ed.) Citation

Bizet, Georges, et al. Carmen: Oper in Vier Akten. Ahn, 1900.