MLA

Stieglitz, Alfred, 1864-1946. Roosevelt, Eleanor. Box 211, folder 3715. 1944 Feb 10. https://collections.library.yale.edu/catalog/17105690.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 211, folder 3715"])(1944 Feb 10)[Roosevelt, Eleanor]. https://collections.library.yale.edu/catalog/17105690.