MLA

Stieglitz, Alfred, 1864-1946. Hartley, Marsden. Box 22, folder 523-535. 1911-23. https://collections.library.yale.edu/catalog/16733644.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 22, folder 523-535"])(1911-23)[Hartley, Marsden]. https://collections.library.yale.edu/catalog/16733644.