Cite

[Watercolor of duck]

MLA

Osborn, Robert Chesley, 1904-. [Watercolor of duck]. Undated. https://collections.library.yale.edu/catalog/2004428.

APA, 6th edition

Osborn, Robert Chesley, 1904-. (Undated)[[Watercolor of duck]]. https://collections.library.yale.edu/catalog/2004428.