MLA

The Amiable Miss H-f-x The Vehement Secretary. [Graphic]. Publish'd by A. Hamilton Junr. Fleet Street, 0AD. https://collections.library.yale.edu/catalog/10727892.

APA, 6th edition

The amiable Miss H-f-x The vehement secretary. [graphic]. (0 C.E.). [Portrait prints, Periodical illustrations, Stipple engravings England London 1784]. Publish'd by A. Hamilton Junr. Fleet Street. https://collections.library.yale.edu/catalog/10727892.