MLA

Stieglitz, Alfred, 1864-1946. Letters. Box 90, folder 1793-1795. 1938 Aug-Oct. https://collections.library.yale.edu/catalog/2042405.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 90, folder 1793-1795"])(1938 Aug-Oct)[Letters]. https://collections.library.yale.edu/catalog/2042405.