Cite

Horace Walpole afterwards Earl of Orford [art original].

MLA

Lens, Bernard, 1682-1740, artist. Horace Walpole afterwards Earl of Orford [art original].. [ca. 1727]. https://collections.library.yale.edu/catalog/15960096.

APA, 6th edition

Lens, Bernard, 1682-1740, artist. ([ca. 1727])[Horace Walpole afterwards Earl of Orford [art original].]. https://collections.library.yale.edu/catalog/15960096.