MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Burliuk, David; Burliuk, Marussia. Box 7, folder 171-176. 1924-1951, undated. https://collections.library.yale.edu/catalog/32202417.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 7, folder 171-176"])(1924-1951, undated)[Burliuk, David; Burliuk, Marussia]. https://collections.library.yale.edu/catalog/32202417.