MLA

Steinberg, Saul, 1914-1999. Untitled [Five abstract figures with hats, coats and hands in their pockets]. Box 539 (Oversize), folder 7273. undated. https://collections.library.yale.edu/catalog/33092003.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 539 (Oversize), folder 7273"])(undated)[Untitled [Five abstract figures with hats, coats and hands in their pockets]]. https://collections.library.yale.edu/catalog/33092003.