Cite

"1868 Treaty" [Treaty of Fort Laramie]

MLA

Erdoes, Richard, 1912-2008. "1868 Treaty" [Treaty of Fort Laramie]. Box 180 | Folder 961. 1973-1974, undated. https://collections.library.yale.edu/catalog/17266039.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 180 | Folder 961"])(1973-1974, undated)["1868 Treaty" [Treaty of Fort Laramie]]. https://collections.library.yale.edu/catalog/17266039.