MLA

Trager, George E. [Malnourished Dakota Indian Woman in a Tipi]. 1891. https://collections.library.yale.edu/catalog/2038368.

APA, 6th edition

Trager, G. E. (1891). [Malnourished Dakota Indian woman in a tipi] [Albumen prints, Card photographs, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2038368.