Letters
MLA
Stieglitz, Alfred, 1864-1946. Letters. Box 90, folder 1788-1791. 1937 Jul-Oct. https://collections.library.yale.edu/catalog/2042400.
APA, 6th edition
Stieglitz, Alfred, 1864-1946. (["Box 90, folder 1788-1791"])(1937 Jul-Oct)[Letters]. https://collections.library.yale.edu/catalog/2042400.