MLA

Bryher, 1894-1983. Der Traümende Mund. Box 168, folder 5614. n.d.. https://collections.library.yale.edu/catalog/10189988.

APA, 6th edition

Bryher, 1894-1983. (["Box 168, folder 5614"])(n.d.)[Der Traümende Mund]. https://collections.library.yale.edu/catalog/10189988.