MLA

The Honble. Charles James Fox [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/10723472.

APA, 6th edition

The Honble. Charles James Fox [graphic]. (0 C.E.). [Portrait prints, Engravings England London 1781, Etchings England London 1781]. publisher not identified. https://collections.library.yale.edu/catalog/10723472.