MLA

Harding, G. P. (George Perfect), 1780-1853, artist. Lord Bolingbroke, at Strawberry Hill [art original].. [not after 1806?]. https://collections.library.yale.edu/catalog/16729688.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([not after 1806?])[Lord Bolingbroke, at Strawberry Hill [art original].]. https://collections.library.yale.edu/catalog/16729688.