Cite

[Horace Walpole, Earl of Orford] [graphic].

MLA

Barlow, Inigo, and publisher printmaker. [Horace Walpole, Earl of Orford] [Graphic]. I. Barlow, 0AD. https://collections.library.yale.edu/catalog/11134315.

APA, 6th edition

Barlow, I., & printmaker, publisher. (0 C.E.). [Horace Walpole, Earl of Orford] [graphic]. [Portrait prints, Etchings England London 1796, Engravings England London 1796, Trials proofs]. I. Barlow. https://collections.library.yale.edu/catalog/11134315.