MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. [Cochran, Aso Neith Neypá. Conversations with], holograph. Box 49, folder 1439-1441. 1927-32, n.d.. https://collections.library.yale.edu/catalog/16694446.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 49, folder 1439-1441"])(1927-32, n.d.)[[Cochran, Aso Neith Neypá. Conversations with], holograph]. https://collections.library.yale.edu/catalog/16694446.