MLA

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. Early draft, typescript, corrected. Box 1, folder 24-26. n.d.. https://collections.library.yale.edu/catalog/2040338.

APA, 6th edition

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. (["Box 1, folder 24-26"])(n.d.)[Early draft, typescript, corrected]. https://collections.library.yale.edu/catalog/2040338.