MLA

The Political Weeping Willow [Graphic]. Pubd. May 13, 1791, by W. Holland, No. 50 Oxford Street, 0AD. https://collections.library.yale.edu/catalog/10732582.

APA, 6th edition

The political weeping willow [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1791, Etchings England London 1791]. Pubd. May 13, 1791, by W. Holland, No. 50 Oxford Street. https://collections.library.yale.edu/catalog/10732582.