MLA

Proteus [the] 2d in Sev'Ral among His Many Publick Characters [Graphic]. Pubd. as the Act directs, 12 Jan., 1784 by G. Humphrey No. 48 Long Acre, 0AD. https://collections.library.yale.edu/catalog/10727377.

APA, 6th edition

Proteus [the] 2d in sev'ral among his many publick characters [graphic]. (0 C.E.). [Satires (Visual works) England 1784, Etchings England London 1784, Political cartoons England 1784]. Pubd. as the Act directs, 12 Jan., 1784 by G. Humphrey No. 48 Long Acre. https://collections.library.yale.edu/catalog/10727377.