Letters
MLA
Stieglitz, Alfred, 1864-1946. Letters. Box 75, folder 1586-1588. 1939 Jul-Sep. https://collections.library.yale.edu/catalog/2043462.
APA, 6th edition
Stieglitz, Alfred, 1864-1946. (["Box 75, folder 1586-1588"])(1939 Jul-Sep)[Letters]. https://collections.library.yale.edu/catalog/2043462.