Cite

[The Duke Humphrey Triptych] [art original]

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. [The Duke Humphrey Triptych] [art original]. [between 1810 and 1815]. https://collections.library.yale.edu/catalog/33328438.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([between 1810 and 1815])[[The Duke Humphrey Triptych] [art original]]. https://collections.library.yale.edu/catalog/33328438.