MLA

Broch, Hermann, 1886-1951. Early draft, typescript, corrected. Box 28, folder 768-69. n.d.. https://collections.library.yale.edu/catalog/2021510.

APA, 6th edition

Broch, Hermann, 1886-1951. (["Box 28, folder 768-69"])(n.d.)[Early draft, typescript, corrected]. https://collections.library.yale.edu/catalog/2021510.