Cite

George III, King of Great Britain &c. &c. &c [graphic].

MLA

George III, King of Great Britain &c. &c. &c [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/11001139.

APA, 6th edition

George III, King of Great Britain &c. &c. &c [graphic]. (0 C.E.). [Portrait prints, Engravings England London 1771]. publisher not identified. https://collections.library.yale.edu/catalog/11001139.