MLA

Fox, George W., 1853-1886. Recto: Eleven American Indians in battle with unseen enemy Verso: American Indian camp showing two horses, six Indians, and a tipi. Box 2, folder 27. 1876. https://collections.library.yale.edu/catalog/2007831.

APA, 6th edition

Fox, George W., 1853-1886. (["Box 2, folder 27"])(1876)[Recto: Eleven American Indians in battle with unseen enemy Verso: American Indian camp showing two horses, six Indians, and a tipi]. https://collections.library.yale.edu/catalog/2007831.