MLA

The Right Honourable Horace Walpole, Earl of Orford, Viscount & Baron Walpole, and Baron of Houghton [Graphic]. Richard Bentley & Son, 1891. https://collections.library.yale.edu/catalog/17288826.

APA, 6th edition

The Right Honourable Horace Walpole, Earl of Orford, Viscount & Baron Walpole, and Baron of Houghton [graphic]. (1891). [Genealogy, Coats of arms Great Britain, Engravings England]. Richard Bentley & Son. https://collections.library.yale.edu/catalog/17288826.