Cite

[Portrait of Mrs. Porteus] [art original]

MLA

Downman, John, 1750-1824, artist. [Portrait of Mrs. Porteus] [art original]. [1790]. https://collections.library.yale.edu/catalog/15960089.

APA, 6th edition

Downman, John, 1750-1824, artist. ([1790])[[Portrait of Mrs. Porteus] [art original]]. https://collections.library.yale.edu/catalog/15960089.