Cite

Fat Bear, Curly Hair, Dull Knife; Dog soldier chiefs, prisoners at Fort Dodge in 1870

MLA

Fat Bear, Curly Hair, Dull Knife; Dog Soldier Chiefs, Prisoners at Fort Dodge in 1870. William Soule, 0AD. https://collections.library.yale.edu/catalog/2010363.

APA, 6th edition

Fat Bear, Curly Hair, Dull Knife; Dog soldier chiefs, prisoners at Fort Dodge in 1870. (0 C.E.). [Photographic prints, Photographs]. William Soule. https://collections.library.yale.edu/catalog/2010363.