Cite

[Sketch of one mounted Indian, several on foot] No. 9

MLA

Eagle, Soaring. [Sketch of One Mounted Indian, Several on Foot] No. 9. 0AD. https://collections.library.yale.edu/catalog/2007827.

APA, 6th edition

Eagle, S. (0 C.E.). [Sketch of one mounted Indian, several on foot] No. 9 [Book covers, Drawings]. https://collections.library.yale.edu/catalog/2007827.