MLA

The Elegant Mrs. O-n The Approved Magistrate. [Graphic]. Publish'd by A. Hamilton Junr., Fleet Street, 0AD. https://collections.library.yale.edu/catalog/10727301.

APA, 6th edition

The elegant Mrs. O-n The approved magistrate. [graphic]. (0 C.E.). [Portrait prints, Periodical illustrations, Engravings England London 1783, Stipple engravings England London 1783]. Publish'd by A. Hamilton Junr., Fleet Street. https://collections.library.yale.edu/catalog/10727301.