Cite

His Royal Highness William Henry, Duke of Glocester, &c [graphic].

MLA

His Royal Highness William Henry, Duke of Glocester, &c [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/16193396.

APA, 6th edition

His Royal Highness William Henry, Duke of Glocester, &c [graphic]. (0 C.E.). [Portrait prints, Mezzotints England London 1771]. publisher not identified. https://collections.library.yale.edu/catalog/16193396.