Cite

Untitled [New Yorker envelope with rubber stamps]

MLA

Steinberg, Saul, 1914-1999. Untitled [New Yorker envelope with rubber stamps]. Box 76, folder 1436. undated. https://collections.library.yale.edu/catalog/16855935.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 76, folder 1436"])(undated)[Untitled [New Yorker envelope with rubber stamps]]. https://collections.library.yale.edu/catalog/16855935.