MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. International Symphony. Introductory concert, 1930 Feb 9. Clippings, finances, correspondence, invitation. Box 90, folder 2327. 1930, n.d.. https://collections.library.yale.edu/catalog/2014457.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 90, folder 2327"])(1930, n.d.)[International Symphony. Introductory concert, 1930 Feb 9. Clippings, finances, correspondence, invitation]. https://collections.library.yale.edu/catalog/2014457.