MLA

Steinberg, Saul, 1914-1999. Untitled [Woman seated]. Box 78, folder 1633. undated. https://collections.library.yale.edu/catalog/32457612.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 78, folder 1633"])(undated)[Untitled [Woman seated]]. https://collections.library.yale.edu/catalog/32457612.