MLA

Stieglitz, Alfred, 1864-1946. "Day," typescript. Box 100, folder 2119. 1922 Jan 7. https://collections.library.yale.edu/catalog/17105671.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 100, folder 2119"])(1922 Jan 7)["Day," typescript]. https://collections.library.yale.edu/catalog/17105671.