Cite

[Portrait of an unidentified man] [art original]

MLA

Cook, G., fl. 1846, artist. [Portrait of an unidentified man] [art original]. [18--?]. https://collections.library.yale.edu/catalog/11001144.

APA, 6th edition

Cook, G., fl. 1846, artist. ([18--?])[[Portrait of an unidentified man] [art original]]. https://collections.library.yale.edu/catalog/11001144.