Cite

Catharine Duchess of Buckingham [art original]

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. Catharine Duchess of Buckingham [art original]. [1810]. https://collections.library.yale.edu/catalog/16704418.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([1810])[Catharine Duchess of Buckingham [art original]]. https://collections.library.yale.edu/catalog/16704418.