Untitled [Self-addressed, faux stamped envelope]
MLA
Steinberg, Saul, 1914-1999. Untitled [Self-addressed, faux stamped envelope]. Box 76, folder 1486. undated. https://collections.library.yale.edu/catalog/16855984.
APA, 6th edition
Steinberg, Saul, 1914-1999. (["Box 76, folder 1486"])(undated)[Untitled [Self-addressed, faux stamped envelope]]. https://collections.library.yale.edu/catalog/16855984.