MLA

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. Outline and synopsis of play, holograph and typescript. Box 3, folder 58. n.d.. https://collections.library.yale.edu/catalog/16732026.

APA, 6th edition

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. (["Box 3, folder 58"])(n.d.)[Outline and synopsis of play, holograph and typescript]. https://collections.library.yale.edu/catalog/16732026.