MLA

Theatre Royal (Bath, England). This present Saturday, April 30, 1808, will be presented the tragedy of Douglas ... : to which will be added, a grand historical musical drama, called King Richard coeur de lion .... [1808]. https://collections.library.yale.edu/catalog/33208632.

APA, 6th edition

Theatre Royal (Bath, England). ([1808])[This present Saturday, April 30, 1808, will be presented the tragedy of Douglas ... : to which will be added, a grand historical musical drama, called King Richard coeur de lion ...]. https://collections.library.yale.edu/catalog/33208632.