MLA

Wilson, Edmund, 1895-1972. Jim Crow. Box 204, folder 4997. n.d.. https://collections.library.yale.edu/catalog/2005084.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 204, folder 4997"])(n.d.)[Jim Crow]. https://collections.library.yale.edu/catalog/2005084.