Cite

Lord North at the Spanish ambassador's [graphic]

MLA

Lord North at the Spanish Ambassador's [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/10715802.

APA, 6th edition

Lord North at the Spanish ambassador's [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1772, Periodical illustrations, Etchings England London 1772]. publisher not identified. https://collections.library.yale.edu/catalog/10715802.