MLA

Steinberg, Saul, 1914-1999. Untitled [Art of Living: Five people waiting under awning during rainstorm with doorman]. Box 447, folder 6123. circa 1945. https://collections.library.yale.edu/catalog/16849992.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 447, folder 6123"])(circa 1945)[Untitled [Art of Living: Five people waiting under awning during rainstorm with doorman]]. https://collections.library.yale.edu/catalog/16849992.