MLA

Theatre Royal (York, England). On Saturday evening, May 14th, 1803, their Majesties Servants will perform a new comedy never acted here, call'd Hear both sides ... : after which, the favourite musical entertainment of The adopted child .... [1803]. https://collections.library.yale.edu/catalog/33208333.

APA, 6th edition

Theatre Royal (York, England). ([1803])[On Saturday evening, May 14th, 1803, their Majesties Servants will perform a new comedy never acted here, call'd Hear both sides ... : after which, the favourite musical entertainment of The adopted child ...]. https://collections.library.yale.edu/catalog/33208333.