MLA

Bryher, 1894-1983. "Hermann Hesse": typescript, original and carbon. Box 90, folder 3332. n.d.. https://collections.library.yale.edu/catalog/17290860.

APA, 6th edition

Bryher, 1894-1983. (["Box 90, folder 3332"])(n.d.)["Hermann Hesse": typescript, original and carbon]. https://collections.library.yale.edu/catalog/17290860.