MLA

Barthelmess, Christian, 1854-1906. Group in front of the Pony Trader's Store, a general merchandise store. The group consists of six white men, four Indian men, two Indian women, and a white girl. Box 2. 1888-1889. https://collections.library.yale.edu/catalog/16174245.

APA, 6th edition

Barthelmess, Christian, 1854-1906. (["Box 2"])(1888-1889)[Group in front of the Pony Trader's Store, a general merchandise store. The group consists of six white men, four Indian men, two Indian women, and a white girl]. https://collections.library.yale.edu/catalog/16174245.