Cite

"Old Photos Sioux, Cheyenne"

MLA

Erdoes, Richard, 1912-2008. "Old Photos Sioux, Cheyenne". Box 52. 1976, undated. https://collections.library.yale.edu/catalog/2081641.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 52"])(1976, undated)["Old Photos Sioux, Cheyenne"]. https://collections.library.yale.edu/catalog/2081641.