MLA

Barlow, Inigo, and printmaker. Horace Walpole, Earl of Orford [Graphic]. Published as the act directs Feby. 14th, 1797, by W. Clarke, No. 38 New Bond Street, 0AD. https://collections.library.yale.edu/catalog/11134317.

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 as the act directs Feby. 14th, 1797, by W. Clarke, No. 38 New Bond Street. https://collections.library.yale.edu/catalog/11134317.