Cite

[Portrait of two men] [art original].

MLA

[Portrait of Two Men] [Art Original]. 0AD. https://collections.library.yale.edu/catalog/15815798.

APA, 6th edition

[Portrait of two men] [art original]. (0 C.E.). [Portrait drawings, Crayon drawings, Amateur works]. https://collections.library.yale.edu/catalog/15815798.