MLA

Theatre Royal (Bath, England). This present Thursday, May 1, 1806, will be presented (by particular desire) the tragedy of Barbarossa .... [1806]. https://collections.library.yale.edu/catalog/33208528.

APA, 6th edition

Theatre Royal (Bath, England). ([1806])[This present Thursday, May 1, 1806, will be presented (by particular desire) the tragedy of Barbarossa ...]. https://collections.library.yale.edu/catalog/33208528.