MLA

Stieglitz, Alfred, 1864-1946. Letters. Box 87, folder 1743-1749. 1932 May-Nov. https://collections.library.yale.edu/catalog/2040493.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 87, folder 1743-1749"])(1932 May-Nov)[Letters]. https://collections.library.yale.edu/catalog/2040493.