MLA

Mitchell, Alfred, 1832-. "Family History," vol. IV. Box 30, folder 16. 1850-1910. https://collections.library.yale.edu/catalog/10015270.

APA, 6th edition

Mitchell, Alfred, 1832-. (["Box 30, folder 16"])(1850-1910)["Family History," vol. IV]. https://collections.library.yale.edu/catalog/10015270.