MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Annot. Box 2, folder 50-52. 1934-52, n.d.. https://collections.library.yale.edu/catalog/17047940.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 2, folder 50-52"])(1934-52, n.d.)[Annot]. https://collections.library.yale.edu/catalog/17047940.