MLA

Frogs Chusing a King [Graphic]. Pub. by J. Aiken, the corner Bare Street, Leicester Square, 0AD. https://collections.library.yale.edu/catalog/10731083.

APA, 6th edition

Frogs chusing a king [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1789, Etchings England London 1789]. Pub. by J. Aiken, the corner Bare Street, Leicester Square. https://collections.library.yale.edu/catalog/10731083.