MLA

Stein, Gertrude, 1874-1946. Saroyan, William. Box 123, folder 2661. 1934. https://collections.library.yale.edu/catalog/2025599.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 123, folder 2661"])(1934)[Saroyan, William]. https://collections.library.yale.edu/catalog/2025599.