MLA

Thomas Howard, IV Duke of Norfolk the Original Is at Strawberry Hill. [Graphic]. John Thane, 0AD. https://collections.library.yale.edu/catalog/16229188.

APA, 6th edition

Thomas Howard, IV Duke of Norfolk the original is at Strawberry Hill. [graphic]. (0 C.E.). [Portrait prints, Etchings England London 1788, Watermarks (Paper) J. Whatman]. John Thane. https://collections.library.yale.edu/catalog/16229188.