MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Brochure Quarterly. Box 90, folder 2330. 1928 Jul. https://collections.library.yale.edu/catalog/17266188.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 90, folder 2330"])(1928 Jul)[Brochure Quarterly]. https://collections.library.yale.edu/catalog/17266188.