Cite

Negative: "film of picture of C.H.O. negative": portrait

MLA

Cadmus, Paul, 1904-1999. Negative: "film of picture of C.H.O. negative": portrait. undated. https://collections.library.yale.edu/catalog/33231117.

APA, 6th edition

Cadmus, Paul, 1904-1999. (undated)[Negative: "film of picture of C.H.O. negative": portrait]. https://collections.library.yale.edu/catalog/33231117.