MLA

Royal Congratulations [Graphic]. Pub. October 1820 by T. Dolby, 299 Strand, 0AD. https://collections.library.yale.edu/catalog/33245960.

APA, 6th edition

Royal congratulations [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1820, Etchings England London 1820, Annotations (Provenance) 19th century]. Pub. October 1820 by T. Dolby, 299 Strand. https://collections.library.yale.edu/catalog/33245960.