Cite

[Portrait of John Speed from an engraved frontispiece] [art original]

MLA

Barber, Christopher, 1735 or 1736-1810, artist. [Portrait of John Speed from an engraved frontispiece] [art original]. [1754]. https://collections.library.yale.edu/catalog/11001151.

APA, 6th edition

Barber, Christopher, 1735 or 1736-1810, artist. ([1754])[[Portrait of John Speed from an engraved frontispiece] [art original]]. https://collections.library.yale.edu/catalog/11001151.