MLA

Theatre Royal (Bath, England). This present Saturday, May 1, 1806, will be presented the favourite play of Castle spectre .... [1806]. https://collections.library.yale.edu/catalog/33208587.

APA, 6th edition

Theatre Royal (Bath, England). ([1806])[This present Saturday, May 1, 1806, will be presented the favourite play of Castle spectre ...]. https://collections.library.yale.edu/catalog/33208587.