MLA

Opposition Music, or, Freedom of Election [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/10728485.

APA, 6th edition

Opposition music, or, Freedom of election [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1788, Engravings England London 1788, Etchings England London 1788, Watermarks (Paper) J Whatman]. publisher not identified. https://collections.library.yale.edu/catalog/10728485.