[Letters : multiple correspondents, 1966 to Saul Steinberg]
MLA
[Letters : Multiple Correspondents, 1966 to Saul Steinberg]. 0AD. https://collections.library.yale.edu/catalog/10034286.
APA, 6th edition
[Letters : multiple correspondents, 1966 to Saul Steinberg]. (0 C.E.). [Autographs, Business records, correspondence (AAT), drawings (AAT), Greeting cards, Hand coloring, illustrations (AAT), manuscripts (AAT), postcards (AAT), Receipts, Typescripts]. https://collections.library.yale.edu/catalog/10034286.