MLA

Gilbert, W. S. (William Schwenck), 1836-1911. An entirely new and original Japanese opera : in two acts, entitled The Mikado, or, The town of Titipu / written by W.S. Gilbert ; composed by Arthur Sullivan .... [1885]. https://collections.library.yale.edu/catalog/2020457.

APA, 6th edition

Gilbert, W. S. (William Schwenck), 1836-1911. ([1885])[An entirely new and original Japanese opera : in two acts, entitled The Mikado, or, The town of Titipu / written by W.S. Gilbert ; composed by Arthur Sullivan ...]. https://collections.library.yale.edu/catalog/2020457.