Cite

Untitled [Twenty sketches of stamps and cancellations for rubber stamps affixed to a piece of paper]

MLA

Steinberg, Saul, 1914-1999. Untitled [Twenty sketches of stamps and cancellations for rubber stamps affixed to a piece of paper]. Box 76, folder 1481. undated. https://collections.library.yale.edu/catalog/16855979.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 76, folder 1481"])(undated)[Untitled [Twenty sketches of stamps and cancellations for rubber stamps affixed to a piece of paper]]. https://collections.library.yale.edu/catalog/16855979.