MLA

Stieglitz, Alfred, 1864-1946. Letters. Box 73, folder 1555-1559. 1935 Sep-Nov. https://collections.library.yale.edu/catalog/2042264.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 73, folder 1555-1559"])(1935 Sep-Nov)[Letters]. https://collections.library.yale.edu/catalog/2042264.