MLA

How to Ride a Horse upon Three Legs Discover'd Ann: Dom: 1768 / [Graphic]. Publish'd Sepr. 1, 1786, by W. Dickinson, engraver & printseller, No. 158 Bond Street, 0AD. https://collections.library.yale.edu/catalog/10728179.

APA, 6th edition

How to ride a horse upon three legs discover'd ann: dom: 1768 / [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1786, Stipple engravings England London 1786, Book illustrations]. Publish'd Sepr. 1, 1786, by W. Dickinson, engraver & printseller, No. 158 Bond Street. https://collections.library.yale.edu/catalog/10728179.