MLA

Steinberg, Saul, 1914-1999. Various clippings and unidentified published artwork. Box 493, folder 6928. circa 1930s-1940s. https://collections.library.yale.edu/catalog/2054477.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 493, folder 6928"])(circa 1930s-1940s)[Various clippings and unidentified published artwork]. https://collections.library.yale.edu/catalog/2054477.