Background materials
MLA
Wilson, Edmund, 1895-1972. Background materials. Box 97, folder 2429-2430. 1922-29, n.d.. https://collections.library.yale.edu/catalog/17434263.
APA, 6th edition
Wilson, Edmund, 1895-1972. (["Box 97, folder 2429-2430"])(1922-29, n.d.)[Background materials]. https://collections.library.yale.edu/catalog/17434263.