MLA

Stein, Gertrude, 1874-1946. Typescript copy. Box 2, folder 55. n.d.. https://collections.library.yale.edu/catalog/17105696.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 2, folder 55"])(n.d.)[Typescript copy]. https://collections.library.yale.edu/catalog/17105696.