MLA

Barthelmess, Christian, 1854-1906. Scouts in camp, including two Apache Indian men holding rifles and two white men, of the Sixth Cavalry. Box 2. 1884-1886. https://collections.library.yale.edu/catalog/16174244.

APA, 6th edition

Barthelmess, Christian, 1854-1906. (["Box 2"])(1884-1886)[Scouts in camp, including two Apache Indian men holding rifles and two white men, of the Sixth Cavalry]. https://collections.library.yale.edu/catalog/16174244.