MLA

[William Pitt Attacked by Barbers] [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/33379149.

APA, 6th edition

[William Pitt attacked by barbers] [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1795, Etchings England London 1795, Watermarks (Paper) J. Whatman]. publisher not identified. https://collections.library.yale.edu/catalog/33379149.