MLA

Barry, D. F. (David Francis), 1854-1934. Sitting Bull. ca. 1890. https://collections.library.yale.edu/catalog/2008117.

APA, 6th edition

Barry, D. F. (David Francis), 1854-1934. (ca. 1890)[Sitting Bull]. https://collections.library.yale.edu/catalog/2008117.