Citazione APA

Offenbach, J., Amcotts, V., Meilhac, H., & Halévy, L. (1860). Fair Helen: A comic opera in three acts. s.n..

Stile di citazione Chicago

Offenbach, Jacques, Vincent Amcotts, Henri Meilhac, e Ludovic Halévy. Fair Helen: A Comic Opera in Three Acts. [S.l.: s.n., 1860.

Citazione MLA

Offenbach, Jacques, et al. Fair Helen: A Comic Opera in Three Acts. s.n., 1860.