Cite

Black Horse and Chief Standing Elk ...

MLA

Grabill, J. C. H. (John C. H.). Black Horse and Chief Standing Elk .... https://collections.library.yale.edu/catalog/2018514.

APA, 6th edition

Grabill, J. C. H. (John C. H.). [Black Horse and Chief Standing Elk ...]. https://collections.library.yale.edu/catalog/2018514.