MLA

Stieglitz, Alfred, 1864-1946. Letters. Box 89, folder 1764-1770. 1934 Jul-Oct. https://collections.library.yale.edu/catalog/2041987.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 89, folder 1764-1770"])(1934 Jul-Oct)[Letters]. https://collections.library.yale.edu/catalog/2041987.