MLA

Stieglitz, Alfred, 1864-1946. Glaser, Curt. Box 21, folder 482. 1932, n.d.. https://collections.library.yale.edu/catalog/17105631.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 21, folder 482"])(1932, n.d.)[Glaser, Curt]. https://collections.library.yale.edu/catalog/17105631.