MLA

Stein, Gertrude, 1874-1946. Yale University Library. Box 12, folder 183. 1937. https://collections.library.yale.edu/catalog/17171504.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 12, folder 183"])(1937)[Yale University Library]. https://collections.library.yale.edu/catalog/17171504.