MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Harris, Lawren. Box 17, folder 472. 1926-50, n.d.. https://collections.library.yale.edu/catalog/16694416.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 17, folder 472"])(1926-50, n.d.)[Harris, Lawren]. https://collections.library.yale.edu/catalog/16694416.