MLA

Steinberg, Saul, 1914-1999. Untitled [Two bird women]. Box 80, folder 1800. circa 1959. https://collections.library.yale.edu/catalog/16856367.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 80, folder 1800"])(circa 1959)[Untitled [Two bird women]]. https://collections.library.yale.edu/catalog/16856367.