MLA

The Subtle Countess The Seduced Soldier. [Graphic]. Published by A. Hamilton Junr., Fleet Street, 0AD. https://collections.library.yale.edu/catalog/10728292.

APA, 6th edition

The subtle countess The seduced soldier. [graphic]. (0 C.E.). [Portrait prints, Periodical illustrations, Engravings England London 1787, Stipple engravings England London 1787]. Published by A. Hamilton Junr., Fleet Street. https://collections.library.yale.edu/catalog/10728292.