MLA

Dean, T. A., and printmaker. [Horace Walpole, Earl of Orford. Aetatis Suae 28, 1745] [Graphic]. Richard Bentley, 0AD. https://collections.library.yale.edu/catalog/15815259.

APA, 6th edition

Dean, T. A., & printmaker. (0 C.E.). [Horace Walpole, Earl of Orford. Aetatis suae 28, 1745] [graphic]. [Portrait prints, Etchings England London 1833, Stipple engravings England London 1833, Chine collé prints England London 1833, Proofs]. Richard Bentley. https://collections.library.yale.edu/catalog/15815259.