MLA

Steinberg, Saul, 1914-1999. Coordinates. Box 456, folder 6313. undated. https://collections.library.yale.edu/catalog/16849869.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 456, folder 6313"])(undated)[Coordinates]. https://collections.library.yale.edu/catalog/16849869.