MLA

Steinberg, Saul, 1914-1999. Armful Question Marks. Box 452, folder 6230. 1961. https://collections.library.yale.edu/catalog/16849865.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 452, folder 6230"])(1961)[Armful Question Marks]. https://collections.library.yale.edu/catalog/16849865.