MLA

A Nautical Impromptu [Graphic]. Publd. Augt. 22d, 1827, by S.W. Fores, 41 Piccadilly, London, 0AD. https://collections.library.yale.edu/catalog/16704580.

APA, 6th edition

A nautical impromptu [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1827, Etchings England London 1827]. Publd. Augt. 22d, 1827, by S.W. Fores, 41 Piccadilly, London. https://collections.library.yale.edu/catalog/16704580.