MLA

Stieglitz, Alfred, 1864-1946. Herrmann, Eva. Box 24, folder 567. 1926-42, n.d.. https://collections.library.yale.edu/catalog/17105633.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 24, folder 567"])(1926-42, n.d.)[Herrmann, Eva]. https://collections.library.yale.edu/catalog/17105633.