MLA

Harding, G. P. (George Perfect), 1780-1853, artist. John Bradshaw from a drawing by Bullfinch in the collection at Strawberry Hill / [art original]. [between 1807 and 1812?]. https://collections.library.yale.edu/catalog/10708916.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([between 1807 and 1812?])[John Bradshaw from a drawing by Bullfinch in the collection at Strawberry Hill / [art original]]. https://collections.library.yale.edu/catalog/10708916.