Cite

[Lady Diana Beauclerk] [art original].

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. [Lady Diana Beauclerk] [art original].. [between 1807 and 1812?]. https://collections.library.yale.edu/catalog/11134644.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([between 1807 and 1812?])[[Lady Diana Beauclerk] [art original].]. https://collections.library.yale.edu/catalog/11134644.