MLA

Steinberg, Saul, 1914-1999. [Collages]. Box 59, folder 1064. undated. https://collections.library.yale.edu/catalog/32366743.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 59, folder 1064"])(undated)[[Collages]]. https://collections.library.yale.edu/catalog/32366743.