MLA

The Honble. Spruce Billy Beau Prime Minister of Lilliput [Graphic]. Pubd. June 20 1791 by W. Holland, 50 Oxford St., 0AD. https://collections.library.yale.edu/catalog/10732593.

APA, 6th edition

The Honble. Spruce Billy Beau prime minister of Lilliput [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1791, Etchings England London 1791]. Pubd. June 20 1791 by W. Holland, 50 Oxford St. https://collections.library.yale.edu/catalog/10732593.