MLA

Stieglitz, Alfred, 1864-1946. Notes. Box 95, folder 1867. n.d.. https://collections.library.yale.edu/catalog/2052806.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 95, folder 1867"])(n.d.)[Notes]. https://collections.library.yale.edu/catalog/2052806.