MLA

Stieglitz, Alfred, 1864-1946. Bement, Alon. Box 180, folder 2999. 1916. https://collections.library.yale.edu/catalog/17105680.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 180, folder 2999"])(1916)[Bement, Alon]. https://collections.library.yale.edu/catalog/17105680.