MLA

The Apotheosis of the Dutchess [Graphic]. Pub. 25 May, 1784, by W Humphrey, N. 227 Strand, 0AD. https://collections.library.yale.edu/catalog/10727846.

APA, 6th edition

The apotheosis of the dutchess [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1784, Etchings England London 1784]. Pub. 25 May, 1784, by W Humphrey, N. 227 Strand. https://collections.library.yale.edu/catalog/10727846.