MLA

The Amphibs [Graphic]. Pub. by G. Humphrey, 24 St. James's Street, 0AD. https://collections.library.yale.edu/catalog/10970493.

APA, 6th edition

The amphibs [graphic]. (0 C.E.). [Satires (Visual works) England 1829, Etchings England London 1829, Aquatints England London 1829, Artists' devices]. Pub. by G. Humphrey, 24 St. James's Street. https://collections.library.yale.edu/catalog/10970493.