MLA

Stein, Gertrude, 1874-1946. Contracts. Box 139, folder 3277. 1927-37, n.d.. https://collections.library.yale.edu/catalog/2006551.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 139, folder 3277"])(1927-37, n.d.)[Contracts]. https://collections.library.yale.edu/catalog/2006551.