MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Ray, Man. Box 92, folder 2353. 1921 Feb 16. https://collections.library.yale.edu/catalog/2014487.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 92, folder 2353"])(1921 Feb 16)[Ray, Man]. https://collections.library.yale.edu/catalog/2014487.