Cite

Horace Walpole, Earl of Orford [graphic]

MLA

Barlow, Inigo, and printmaker. Horace Walpole, Earl of Orford [Graphic]. Published Augt. 4th, 1797, by W. Bent, 0AD. https://collections.library.yale.edu/catalog/16193355.

APA, 6th edition

Barlow, I., & printmaker. (0 C.E.). Horace Walpole, Earl of Orford [graphic] [Portrait prints, Etchings England London 1797, Engravings England London 1797]. Published Augt. 4th, 1797, by W. Bent. https://collections.library.yale.edu/catalog/16193355.