MLA

Stieglitz, Alfred, 1864-1946. Rogers and Company. Box 41, folder 990. 1908-17, n.d.. https://collections.library.yale.edu/catalog/10081940.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 41, folder 990"])(1908-17, n.d.)[Rogers and Company]. https://collections.library.yale.edu/catalog/10081940.