MLA

Stein, Gertrude, 1874-1946. Steward, Samuel. Box 11, folder 154-155. 1933-45. https://collections.library.yale.edu/catalog/11874546.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 11, folder 154-155"])(1933-45)[Steward, Samuel]. https://collections.library.yale.edu/catalog/11874546.