MLA

Stieglitz, Alfred, 1864-1946. Note. Box 83, folder 1692. 1919 Jan 26. https://collections.library.yale.edu/catalog/2039553.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 83, folder 1692"])(1919 Jan 26)[Note]. https://collections.library.yale.edu/catalog/2039553.