MLA

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. Article, typescript carbon. Box 2, folder 55. n.d.. https://collections.library.yale.edu/catalog/16732025.

APA, 6th edition

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. (["Box 2, folder 55"])(n.d.)[Article, typescript carbon]. https://collections.library.yale.edu/catalog/16732025.