MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Moholy-Nagy, László. Box 24, folder 700. 1923-44, n.d.. https://collections.library.yale.edu/catalog/16694420.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 24, folder 700"])(1923-44, n.d.)[Moholy-Nagy, László]. https://collections.library.yale.edu/catalog/16694420.