MLA

Steinberg, Saul, 1914-1999. Victory Parade. Box 538 (Oversize), folder 7271. circa 1987. https://collections.library.yale.edu/catalog/16855292.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 538 (Oversize), folder 7271"])(circa 1987)[Victory Parade]. https://collections.library.yale.edu/catalog/16855292.