MLA

The Royal Toast. Fat, Fair, and Forty [Graphic]. Published by W.S. [sic] Fores Mar 20th, 1786 at his Caracature Warehouse, No. 3 Piccadilly, 0AD. https://collections.library.yale.edu/catalog/16740492.

APA, 6th edition

The royal toast. Fat, fair, and forty [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1786, Etchings England London 1786]. Published by W.S. [sic] Fores Mar 20th, 1786 at his Caracature Warehouse, No. 3 Piccadilly. https://collections.library.yale.edu/catalog/16740492.