MLA

Fox, George W., 1853-1886. Recto: Two American Indians on horseback, galloping Verso: American Indian camp, with an United States flag flying above it. Box 2, folder 24. 1876. https://collections.library.yale.edu/catalog/2007825.

APA, 6th edition

Fox, George W., 1853-1886. (["Box 2, folder 24"])(1876)[Recto: Two American Indians on horseback, galloping Verso: American Indian camp, with an United States flag flying above it]. https://collections.library.yale.edu/catalog/2007825.