Cite

Jean Louis de la Vallette, Duke of E'spernon [art original]

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. Jean Louis de la Vallette, Duke of E'spernon [art original]. [1807]. https://collections.library.yale.edu/catalog/16704414.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([1807])[Jean Louis de la Vallette, Duke of E'spernon [art original]]. https://collections.library.yale.edu/catalog/16704414.