MLA

Iohn Bull's Trump [Graphic]. Published August 1820 by G. Humphrey, 27 St. James's Street, 0AD. https://collections.library.yale.edu/catalog/16816905.

APA, 6th edition

Iohn Bull's trump [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1820, Etchings England London 1820, Annotations (Provenance) 19th century]. Published August 1820 by G. Humphrey, 27 St. James's Street. https://collections.library.yale.edu/catalog/16816905.