Untitled [Map series: United States Map superimposed on map of Europe]
MLA
Steinberg, Saul, 1914-1999. Untitled [Map series: United States Map superimposed on map of Europe]. Box 423, folder 5730. undated. https://collections.library.yale.edu/catalog/11702632.
APA, 6th edition
Steinberg, Saul, 1914-1999. (["Box 423, folder 5730"])(undated)[Untitled [Map series: United States Map superimposed on map of Europe]]. https://collections.library.yale.edu/catalog/11702632.