MLA

Stieglitz, Alfred, 1864-1946. Rhoades, Katharine Nash. Box 40, folder 970-978. 1911-22. https://collections.library.yale.edu/catalog/17105650.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 40, folder 970-978"])(1911-22)[Rhoades, Katharine Nash]. https://collections.library.yale.edu/catalog/17105650.