Cite

Sioux ledger drawings, [18--?].

MLA

Horse, Sorrel. Sioux Ledger Drawings, [18--?]. 0AD. https://collections.library.yale.edu/catalog/2001695.

APA, 6th edition

Horse, S. (0 C.E.). Sioux ledger drawings, [18--?]. [Pictorial works, Drawings (visual works) United States]. https://collections.library.yale.edu/catalog/2001695.