APA (7th ed.) Citation

Ashworth, J. H. E. (1893). Leonore: A comic opera in three acts. Dunlop.

Chicago Style (17th ed.) Citation

Ashworth, John H. E. Leonore: A Comic Opera in Three Acts. [London]: Dunlop, 1893.

MLA (8th ed.) Citation

Ashworth, John H. E. Leonore: A Comic Opera in Three Acts. Dunlop, 1893.