MLA

Fox, George W., 1853-1886. United States Army officer addressing a large group, probably the American Indian prisoners wearing their United States Army standard issue dress. Box 1, folder 11. 1876. https://collections.library.yale.edu/catalog/32580394.

APA, 6th edition

Fox, George W., 1853-1886. (["Box 1, folder 11"])(1876)[United States Army officer addressing a large group, probably the American Indian prisoners wearing their United States Army standard issue dress]. https://collections.library.yale.edu/catalog/32580394.