MLA

Stein, Gertrude, 1874-1946. Locket. Box 163, folder 4301. n.d.. https://collections.library.yale.edu/catalog/2003131.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 163, folder 4301"])(n.d.)[Locket]. https://collections.library.yale.edu/catalog/2003131.