MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Alajalov, Constantine. Box 94, folder 2374-2376. 1925-49, n.d.. https://collections.library.yale.edu/catalog/2009343.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 94, folder 2374-2376"])(1925-49, n.d.)[Alajalov, Constantine]. https://collections.library.yale.edu/catalog/2009343.