Sitting Bull. [seated]
MLA
Gilbert, Z. (Zalmon), artist. Sitting Bull. [seated]. ca. 1880. https://collections.library.yale.edu/catalog/2009503.
APA, 6th edition
Gilbert, Z. (Zalmon), artist. (ca. 1880)[Sitting Bull. [seated]]. https://collections.library.yale.edu/catalog/2009503.