MLA

Honest Billy [Graphic]. Pubd. Feby. 18, 1785, by S.W. Fores, No. 3 Piccadilly, 0AD. https://collections.library.yale.edu/catalog/10727965.

APA, 6th edition

Honest Billy [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1785, Etchings England London 1785]. Pubd. Feby. 18, 1785, by S.W. Fores, No. 3 Piccadilly. https://collections.library.yale.edu/catalog/10727965.