Cite

"The Cleft in the Rock," photogravure

MLA

Stieglitz, Alfred, 1864-1946. "The Cleft in the Rock," photogravure. Box 149, folder 2779. n.d.. https://collections.library.yale.edu/catalog/2002403.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 149, folder 2779"])(n.d.)["The Cleft in the Rock," photogravure]. https://collections.library.yale.edu/catalog/2002403.