MLA

Stieglitz, Alfred, 1864-1946. Walkowitz, Abraham. Box 114, folder 2388. 1917. https://collections.library.yale.edu/catalog/32188962.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 114, folder 2388"])(1917)[Walkowitz, Abraham]. https://collections.library.yale.edu/catalog/32188962.