MLA

Theatre Royal (Bath, England). This present Tuesday the 18th of January, 1791, will be perform'd a comic opera, call'd Lionel and Clarissa ... : to which will be added an entertainment, call'd The first floor .... [1791]. https://collections.library.yale.edu/catalog/33208385.

APA, 6th edition

Theatre Royal (Bath, England). ([1791])[This present Tuesday the 18th of January, 1791, will be perform'd a comic opera, call'd Lionel and Clarissa ... : to which will be added an entertainment, call'd The first floor ...]. https://collections.library.yale.edu/catalog/33208385.