MLA

Stieglitz, Alfred, 1864-1946. Fisk University: drafts of letters. Box 191, folder 3232. 1951, n.d.. https://collections.library.yale.edu/catalog/17105684.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 191, folder 3232"])(1951, n.d.)[Fisk University: drafts of letters]. https://collections.library.yale.edu/catalog/17105684.