Equivalent
MLA
Stieglitz, Alfred, 1864-1946. Equivalent. Box 121, folder 2442. [1929]. https://collections.library.yale.edu/catalog/2003547.
APA, 6th edition
Stieglitz, Alfred, 1864-1946. (["Box 121, folder 2442"])([1929])[Equivalent]. https://collections.library.yale.edu/catalog/2003547.