Cite

[Unidentified mission, probably at Pine Ridge Agency, South Dakota]

MLA

Cross, W. R. (William R.). [Unidentified mission, probably at Pine Ridge Agency, South Dakota]. Folder 22. circa 1891. https://collections.library.yale.edu/catalog/16069034.

APA, 6th edition

Cross, W. R. (William R.). (["Folder 22"])(circa 1891)[[Unidentified mission, probably at Pine Ridge Agency, South Dakota]]. https://collections.library.yale.edu/catalog/16069034.