MLA

Stein, Gertrude, 1874-1946. Vest. Box 165, folder 4305. n.d.. https://collections.library.yale.edu/catalog/2003133.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 165, folder 4305"])(n.d.)[Vest]. https://collections.library.yale.edu/catalog/2003133.