MLA

Wilson, Edmund, 1895-1972. EW. Box 198, folder 4823. 1922, n.d.. https://collections.library.yale.edu/catalog/2008063.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 198, folder 4823"])(1922, n.d.)[EW]. https://collections.library.yale.edu/catalog/2008063.