MLA

Stieglitz, Alfred, 1864-1946. Weichsel, John. Box 51, folder 1228. 1913-18. https://collections.library.yale.edu/catalog/15489940.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 51, folder 1228"])(1913-18)[Weichsel, John]. https://collections.library.yale.edu/catalog/15489940.