Cite

Untitled [Six postcards with rubber stamps of standing figures]

MLA

Steinberg, Saul, 1914-1999. Untitled [Six postcards with rubber stamps of standing figures]. Box 77, folder 1531. circa 1970. https://collections.library.yale.edu/catalog/32365779.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 77, folder 1531"])(circa 1970)[Untitled [Six postcards with rubber stamps of standing figures]]. https://collections.library.yale.edu/catalog/32365779.