MLA

Wilson, Edmund, 1895-1972. Tzara, Tristan. Box 66, folder 1842. 1922 Dec 26. https://collections.library.yale.edu/catalog/10598302.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 66, folder 1842"])(1922 Dec 26)[Tzara, Tristan]. https://collections.library.yale.edu/catalog/10598302.