MLA

Steinberg, Saul, 1914-1999. Novus Ordo Seclorum. Box 527 (Oversize), folder 7160. circa 1967. https://collections.library.yale.edu/catalog/12154341.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 527 (Oversize), folder 7160"])(circa 1967)[Novus Ordo Seclorum]. https://collections.library.yale.edu/catalog/12154341.