Cite

The Rt. Honble. Francis Seymour Conway, Earl of Hertford [art original]

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. The Rt. Honble. Francis Seymour Conway, Earl of Hertford [art original]. [1806]. https://collections.library.yale.edu/catalog/16704444.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([1806])[The Rt. Honble. Francis Seymour Conway, Earl of Hertford [art original]]. https://collections.library.yale.edu/catalog/16704444.