Equivalent
MLA
Stieglitz, Alfred, 1864-1946. Equivalent. Box 121, folder 2439. [1926?]. https://collections.library.yale.edu/catalog/2000107.
APA, 6th edition
Stieglitz, Alfred, 1864-1946. (["Box 121, folder 2439"])([1926?])[Equivalent]. https://collections.library.yale.edu/catalog/2000107.